HELP MEE PLEASE!?....?

My horse has had many problems. She is jut getting over epm and I haven't rode for a year almost. Her lope and trot are fine but I've noticed she has really bad Anxiety issues. When I back her up she gets all antsy and will try to move. Forwards backwards anywhere to get away. Idk why she does this and after I canter she wants to trot a lot too and won't walk. Can anyone help me??