Now, here's my last silver lining! >_< Incidentally, there is a such things as Wolfsbane. Why for werewolfs and not vampires? So we haven't heard much about vampires in Harry Potter, but considering the hype against werewolves and vampires, I'm guessing vampires would at least have some sort of protection, something like wolfsbane that allows them to live partially normal lives.
Good note about Vampires only going out at night. That would be a plot point as well as something likely canon-ish. Maybe they can take a potion that allows them to go out during the day? Who knows.
Yes, I can hear you shouting - vampires are vampires all the time... they don't get "breaks" like werewolfs, transforming into vampires only during a specific event or time - but could there be a potion to, not cure, but decrease the vampire-ish-ness of my character?
I love how you've denoted "she" to your vampire. :) My vampire is a female, which is beginning to look like a problem now...
Vampirism is at best a disease, at worst a curse. The lifestyle of a vampire is a horrible one, and one that is filled with fear, loneliness and doubt. A vampire is a slave to her thirst, and lives under the ever present threat of daylight. If either (or worse, both) of these characteristics are removed, then the disease tends to have more plus-points than negatives. I would strongly argue that if a vampire character gains from her condition overall, then they had either be pretty bloody evil or the point has been lost. For all vampires, the sun is both the most obvious threat to their immortality, and a glaring reminder of what is was to be human. In short, the death by sunlight is - to me - one of the defining factors of what makes a vampire, along with the need for blood and fangs.
Last time I checked, fetus's didn't have teeth, so there's not going to be much chewing going on. :p Okay, so the fetus receives it's nutrients from it's mother's blood - but technically, the blood of the child and mother do not mix at all. Nutrients move from the mother's blood to the child's blood through diffusion, but the blood itself does not mix. So I see no reason why the child should become a vampire, unless the placenta ruptures or something - but then the fetus would be dead anyway. This should also mean that the fetus would go on aging.
Well, if we first accept that the vampiric condition is passed on through vampire blood, and then accept that the condition stops the aging process (hence the wonderful condition of the old man vampire who turns out to be 121, and his apparent granddaughter who is 2500, but I digress), then we have a problem. Even if a female vampire could still ovulate, and an egg becomes fertilized, and if the egg was based around her original dna rather than any changes that might have occured, then eventually the embryo is going to settle into the womb wall, and become a foetus.
And how does a foetus get it's necessary nutrients? Through it's mothers blood. (Three billion women scream "That's a gross oversimplification!" - well, yeah. The point stands though) So the foetus is fed vampire blood, and - there and then - becomes a vampire. Equally, while it doesn't have to worry about sunlight too much, and doesn't have to go far to feed, it also means the aging process stops. The foetus does not grow any further whatsoever, and remains in its present state. What is more, because this state would occur very early on in the pregnancy, the mother would never go into labour. The foetus would then spend the rest of it's mother's unlife parasitically taking her blood, while never maturing - unless it was removed. Or, of course, unless it chews its own way out. What a lovely thought that is!
Also, lets say that the fetus did become a vampire and did need blood. Don't vampires suck blood? That means the blood would need to enter their stomachs but no way does anything enter the fetus's "stomach" which is hardly developed and couldn't digest anything anyway. There's no way the fetus could parasitically take a mother's blood... of course... if Vampire Jr. needed the blood to live it would mean the fetus would die, as there is no way for it to get blood while still developing. If I'm not wrong about all of this. :p
"If you become a vampire in this way" you said. So what other way is there, besides being bitten and replenished with the vampire's blood?
2. How does one become a Vampire.
Another In-My-Humble-Opinion, if you wouldn't mind. This depends upon which books you are reading. My opinion is one that seems to be shared to a certain degree within most vampiric books, which is different to the bite of a werewolf, say.
In this train of thought, a vampire is made by first taking a victim (wizard or muggle), and draining them of their blood. Once their blood is drained, and they lie dying, a vampire pours (by methods left to your thought process) it's own blood into them to replenish them. In as such, the vampire's bite causes someone to be a vampire, but is fatal. Only with the addition of the vampires own blood does the victim survive to become a vampire. (Victims fed human blood, or unbitten humans fed Vampire blood, will become White Wolf's version of Ghouls, but I digress)
If you become a vampire in this way, you are prone to certain life changing factors.
Sadly, if this doesn't work out, I'm just going to have to give Vampire Jr. the boot. The story has got an AU warning in store for it already - because it happens to be a canon character who will become a vampire - but now it'll be double AU, because we know this person's had children. >_<