Sketchy Rat

[Nic]

I have a female rat that I want to bread in the next little bit. She is still young and small (150gm). She has some very wierd behaviour. She always seems to twitch her head up and to the left in a very abnormal way. She is not sniffing, and it seems uncontrollable. It is almost like she has tourettes for rats. Has anyone seen anything like this? Should I keep her and have her breed, or should I put her down and use her for food?

Thanks,
Nic