[gemy]

My understanding of the current research, is that even though she could still get mammary gland cancer, she won't be at risk for pyrometra, and less risk for some other cancers.

Also for me if I am not going to breed a female I spay her; I do think it is best in the long run. And btw this is not the decision I would make for males.

Best in the long run encompasses there can't be any accidental breedings, you don't need to track heats and isolate her during heat for her lifetime.

And for what it is worth, I think you made the right decision not to breed her.