Well, it could actually just be a normal heating cycle for her. And if the Tom is still following her, she probably isn't pregnant...it's very rare that males want anything to do with a pregnant female. Or she may have Nymphomania where the queen has irregular heat cycles. Usually it's not deadly but it's good to get it taken care of so that it doesn't do harm to her. Or you could also try and spay her after her heat, maybe they could treat any problem while they do this. Overall I think she'll be all right but it wouldn't hurt to spay. I hope everything goes okay. And good luck, I'm sure it'll be fine.