If you don't feel confident enough to deal with it yourself, send her to a trainer.
I have dealt with a couple trainer horses who were rearing to get out of work. First thing I did was teach them to flex from the ground (bitted). Second thing I did was teach them a one rein stop.
Third thing I did: When I felt them going up, I would snatch them with one rein as to take their balance away. Then I would send them in a few tight circles (They weren't nice circles. I put the boots to them.) Then, release their face and let them walk on. Repeat.
Rearing is a very dangerous issue and I do not take it lightly. It is the ultimate disrespect. Horses are too big and can hurt you too bad. *I* don't put up with it. If I have to scare them by making them fall down when I snatch their face and step off, I will. I DO NOT put up with rearing. But, I am confident enough in myself to do it and I have experience with rear-ers.
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