If you are feeding PML, I would continue to do so. I hope the girl isn't preggo, if she's been fed french fries. Urgh! This is the second time I've heard of someone feeding their gliders french fries. Who in the heck does that??? I mean, we know they're not good for us...why would someone give them to a helpless animal dependent on that person for food???
I would possibly supplement a little extra calcium via nonfat yogurt. Maybe, with them being overweight, just some of the plain yogurt that you sweeten with natural applesauce (no extra sugars/no artificial sweeteners).
I feel so sorry that these babies have had that kind of life, but I am thrilled to read that you'll be taking great care of them! :-)