If you're not seeing any difference in drinking levels to normal, then this is probably OK.
Having said that, if you think she is drinking more than usual, it is best to get this checked out. Is she weeing more than usual or is this about the same?
I've just done the same with my boy (although he is older at 9 years old), thinking that he seemed to be drinking a bit more than usual. He also has a wet/dry food mix, and I figured as well that the heating being on was making him more thirsty, but having checked his bloods/wee etc, he is looking as though he has the onset of kidney issues.
If you're concerned, it doesn't hurt to check with the vets just for peace of mind