It isn’t too late! There is a high chance that she may already have some cancer, but it can be removed in the spay surgery. At the rescue I volunteered at we had a 7 year old rabbit come in that was unspayed. She had a lot of cancer all throughout her uterus and ovaries, but they were able to remove it and she did very well afterwards. Another member here had the same story with their 7 year old rescue bun.
It is important to get a good vet for spays, and you should flat-out ask them how many spays they do, and how often they have complications.
There is always a chance that something can go wrong in a surgery, but in the case of spaying it’s much less likely than the risk of the bun developing cancer (studies have found between 50 and 75% rates of cancer in female rabbits by age 4).
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.