Awww it's only natural to worry (((HUGS))) I've always tried to get my girls spayed on my day off from work as I'm no use nor ornament AT work as my mind is niggling away at me and worrying myself into a tizz
I was a tearful mess in April 2012 when our 17 year old cat had to have an eye removed.....HOW my till (I work in a shop) was ok at the end of the day I'll never know
You're doing the best thing for her though and within a couple of days she'll be bouncing around as normal