Thank you for taking her in!

I'm a bit confused, if she eats a little then hides the rest, is she not that hungry? A skinny dog which has been starving is going to keep eating, until feeling full. I "think." Maybe not overeat, maybe not finish it, but certainly not going to start hiding food if still hungry. Does she go back to what she hid and eat that in an hour? I'm just wondering if she has a health issue.

I think the vet can guide you how to handle the microchip issue.