Oh also, a quirky thing my dog does that yours might have started doing:
90% of the time he doesn't eat unless we're there. If someone's in the kitchen he'll eat (we free feed him as he's not an over eater) if someone's in the other room or by the computer he'll usually grab a few pieces and take them into the other room to eat, then go back and get more.

So if you're feeding her at specific times, but leaving after you give her her food, she may feel like you're going to leave her again.