16-24oz of milk a day is normal for that age. I wouldn't worry about giving her too much unless it seems to be interfering with her solid intake. Like pp said, though, if she's taking it really well, though, it would be a good opportunity to start offering it in a sippy during the day to get her used to it. It's probably a growth spurt. And it's normal for weight gain to slow up around this age as they are getting SO much more active.