Hmmm..has she been spayed? Hope she didn't make a slip outside to meet with the neighborhood boys if not. That is quite large sounding for a kitten, but if she's cut back a bit on her caloric intake, and gets some good long play times with feather toys, laser pointers (careful never to let it shine in eyes) and other toys that rev up her metabolism, chances are she'll be fine. She sounds like one cute armload!