If I were you, I would suggest profiling her along some sort of safe fence, where she would be safe along. Most of the time a tease stallion will get you the results you need to know, whether she is in heat or not. To me, it sounds like she isn't in heat. Though, like already said, there is a chance she could be afraid of the new situation.
Someone correct me if I am wrong, but a stallion himself can also be a tease stallion. I know where I am learning at a barn we use a "tease" stallion, he knows his job.
I would try that, or maybe hobbles if you know for certain she is in heat.