Its not unheard of. Although your seems odd that she went in so often!
I have females who have thier own heat cycle and sometimes will go into heat when the other one does as well. Makes training difficult for me cause theres too many horomones in the air for them to concentrate. Going through this right now as a matter of fact! My males are beside themselves! They are truley pathetic! LOL
Little do they know I have a different male picked out and thier suffering will not end. Buwahahahaha!!!!