Sounds as if she could be spayed when the vet advises. When you take her to the vet on Monday, ask your vet what he/she thinks.
My own view - kittens are weaned, mum is well, she is not calling so you could make an appointment.
If she were my own queen, I would wait until the kittens had gone to their new homes - so that your queen doesn't have the worry of tiny little paws all over her operation wound.
