My leopard geckos toes are gone!?

I recently purchased a leopard gecko. I don't know anything about it cause the person who sold it to me said she got it from a reptile show who didn't know anything about it ether. I think its quite old cause it moves rather slow and is more rinkily than my other gecko. When I bought her I knew something was wrong cause she had a very unique and pretty pattern that iv never seen before but she was only 20 dollars. I inspected her before I got her and she didn't seem sick. She also had a kinda skinny tail but I was sure I could fix that with some butterworms and waxworms. anyway I looked at her toes today and the tips were missing on alot of them! She only has a few good nails let. The others were all bent and mangled so I clipped them(very carefully) on one foot she has only 1 nail! I feel sorry for her as she cant climb well and is slow. All the toes with missing nail have healed up so I see no need to take her to a vet. She has been eating very well to. Today she ate about 6 butterworms and 10 black soldier fly larvae. The other did not eat. Will the nails ever grow back? Or is she doomed to have no nails for the rest of her life? When I picked her up to take a look at her toes I had to hold her a certain way and sometimes she would make a very soft chirp kinda noise. Like a small squeak. Is that normal?