Lily will be healthier, you are so right.

Yes, you will be nervous; I always am, and between cats and dogs I've taken in 8 females. It is a common surgery sot he vets have LOTS of experience.

Be sure you get pain meds to take home with you, for her. Some dogs bounce back, some take a day or 2 to recover from the anesthesia; it is all good. Keep the cone collar on her, keep her calm for a few days, follow the vet's take home instructions, all will be well.