Problems Picking Up Feet...?

Hi, sounds interesting, are ther any scars or old injuries on the leg. It is possible it hurts her to lift it or in the past it has hurt her now she thinks it will hurt if she lifts it and so she doesnt want to. Other then that is she an objectionable horse? does she tend to jack up and dig her heels in about other things? maybee she has gotton away with it for so long its become a bad habit where she has learnt how to get out of lifting her back leg. But if she is lifting her front ones its prob not attitude. I would have somone experienced have a go at it and see what they think. Its too hard over the net.