It would depend a lot on her activity level throughout the day. Also it would depend how her body processes the calories. I'd say the approximate gain of 50 lbs a year is a good rate of gain. As far as gaining faster limit her activity level as much as possible. If she needs a drink go get for her. If she needs the tv remote grab it for her. Basically wait on her hand and foot make her as lazy as possible.
12 years
