A big thank you to everyone for all their advice. I am keeping them separate and feeding them with my carrot stick in had so she does not try to bite or take his food. Being that she is a former race horse all I need to do is show her a stick and she will do anything I ask.
As for gelding, he has let me in to check and I have him scheduled for early next week. Again a big Thank You- hopefully not too late but I will let you know.