I'm so pleased to hear she's doing well!
I've not had a uterus sent off after a spay in my girls. Sometimes my vet saves operative samples and then asks me - as it's easier to save them then discard them than to not take them but want to send them.
My advice on caring for hamsters after surgery is here:
https://vectishams.wordpress.com/201...after-surgery/
I wish her a speedy recovery.