wont let me touch her feet

My pup is 6months old. The first time her claws were clipped was at the vets and she was fine with it. The second time a groomer did them. She has never let me clip them, but before the second time she had no problem with me touching her feet. Now she jumps away and gets freaked out and excited whenever I go near them. She was limping a little outside the other day and wouldn't let me look at it.

I am trying to just go slowly, stroking them while I pet her, and I put some peanut butter on a popsicle stick that she licked while I tried to desensitize her a little. She was less jumpy that way, but still constantly pulled her feet away.

Are there any other ways I can try? I am thinking that the groomer was too rough with her and now she is a little traumatized. I wish they had just said that she struggled too much for them to do it and I would have worked with her then taken her back...