It IS the end of Sept now...you can still have her spayed. I'm assuming you'd decided to have her spayed to begin with for a good reason--that decision doesn't have to change just because she tied with a male. Sounds like you've already made up your mind to let her be bred this time. Just wanted to let you know if you ARE truly worried about her carrying a litter as you claim to be, it is not to late for her to have the surgery and avoid the situation.