Just cull the female. It's just going to get worse in time unless it's an abscess.
Its fine to feed off. Female rats often get mammary tumors due to being bred. And those tumors are usually benign anyway. The tumors are stimulated by estrogen and/or menopause. Roughly 50% of female rats will get mammary tumors and the majority are not cancerous. I'm not saying that cancer never happens, but it's unlikely that they are malignant. I'm sure many people have fed off rats that had unknown pituitary tumors, for example, and their snakes are fine. I know I have with no ill effect.
Most illnesses rodents have are species specific anyway. Not to mention, the biology of a carnivore's stomach is very acidic. Way more than omnivores and herbivores. That high level of acidity is to kill bacteria and other nasties found in raw prey. And a feeder with cancer cannot give cancer to a predator. That's not how cancer spreads......
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