Sorry I did not read all the other answers. But here my 2 cents: The situation you descriped is exactly why I do not use treats to train my horses! (And because it might get a bit expensive when you work with 7 diffrent horses a day :0)) Anyway, you should get a little bit more firm in your training, I like what you do with backing her up, make her move away from you to not be in your space and and and, but if she starts pawing with her feet or anything like that, put all your energy in backing her up, make her work hard to understand that this is not ok! She will understand eventually but she def. Has to accept the fact that you are the leader in your relationship and with a pushy horse like that (at least it sounds like it) you need to be really firm, watch your body language, timing is a big thing - release at the right moment, correct the smallest thing she does that you think is not good, watch her ears and be ready at ALL TIMES to make her work, again make the good thing easy and the bad thing REALLY hard for the horse. I am sure you will fix this issue but it might take some time! Good luck!!!