Ummm, the older three went through that too, with the extra eating sleeping, but they were a bit older - about 3-ish they were from memory. I actually put it down to the weather, because lately they are all eating me out of house and home with the onset of the cooler weather, and they seem to do it every year LOL. but it's not unreasonable for her to be having a growth spurt. If you do think she's not 100% though, just keep an eye on it.