Mattel has been attempting to turn itself around since then, but there hasn't been much visible progress. Mattel's latest quarter was a disaster, with net sales tumbling 13% year over year, gross profit slumping 26%, and operating income plunging 79%. The bankruptcy of Toys "R" Us was a factor, but it was far from Mattel's only problem. The American Girl brand suffered a 30% year over year sales decline, by far the worst performer for Mattel.