The limping may be a separate issue, it's hard to say. Sometimes when they are molting they don't feel good and don't eat well, so giving a b complex or super b complex tablet or capsule (one that contains all the b's, human ones from any pharmacy) once daily can be helpful, deficiencies in the b's can cause neuromuscular symptoms. I've had birds with balance issues or walking like they're drunk, and the b's took care of it. It's also possible that she just tweaked it somehow and it's a sprain or strain, if that's the case then rest and time should take care of it. I would just keep an eye on her. Molt can last several months, If she's not eating well (they often don't, the new feathers are sensitive and uncomfortable so they will often avoid contact with other birds, so may not approach crowded feeders) then try adding extra feeders and giving some higher protein treats like canned tuna or cooked or scrambled eggs. If I know a bird is having issues with molt I will sometimes remove them from the run long enough to feed them something separately, so I know they get it. Then put them back with the others.