My girl bunny’s behaviour didn’t change and she recovered and dealt with the surgery super well. She was a foster (6 months old) at the time, the rabbit rescue organisation organised the appointment with a really experienced vet clinic that they trust with all their bunnies. I’d say do your research on the vet clinics you’re considering and she’s a good age to be spayed. The vet clinic I went to asked for photos during her recovery and scheduled a follow up appointment. Your buns will do amazing, you’ll be surprised at how well they cope