WELCOME to YT

! Your little one sounds just precious to you.
I remember how scared I was each time one of mine got fixed, it's just scary and you worry so much. I hate leaving them at the vet too. When she comes home, she may be really out of it/sluggish/low for several hours, but she will snap out of it. MAKE SURE you get pain medication AND make sure you ask what you're supposed to do if her pain is not alleviated (vet may want you to up the dose).