Fleurp confuses me

So she has been back to licking the cement, and now she has some weight loss again, so I think we are going to have to go back to the vet.  I am curious if it is because she is starving, so I'm slipping her a little extra canned food in the AM and PM, and so far it is working to help her gain weight and stay away from the cement.

But what is causing her to be hungry?

She's always been a little piggy when it came to food; begging, demanding, breaking out the uber adorable irresistible face

thus it really was a jump for me to figure out that she really is hungry.  Fleurp, like Muffin, will eat until they explode, they don't care if they just had a full meal, they'll find room in their skull if need be.

So I'm going to over feed her for a while and see what happens, simply to have more information going in.