Hi! Welcome to YT. I have been through this twice now.
. I have two girls and will try to give you some advice. Both of mine were fixed where I was able to be with them the next day. My vet didn't use stitches and did give pain meds. I think he used the glue??? I didn't use a onesie or collar for either girl. Instead I held them and babied them.
I know, they are spoiled. I was very lucky and had no problems at all. They recovered quickly and did very well. The biggest thing I did was make sure they had limited activity. When I wasn't holding them I had a crate handy. My vet gave me his cell number in case I had any problems. You might ask if there is an emergency number as well. I am sure your sweet girl will do great! Keep us posted!