Hoosier Heartthrob Ragdolls

To my breeder friends: Has anyone experienced this? I have a solid blue sepia female that is a year and a half old. She seems to be in constant heat cycles! Yet when I put her in with a male she will not allow the males to approach, less they want the crap beat out of them!! Any insight on this?? She is a beautiful female and I’ve been waiting patiently for her to be of breeding age!