Hello.
I hope your kitty is all better now, no longer vomiting or having any other troubles.
Your vet needs to be made aware of the after-surgery behavior. If you haven't already, do call and talk to the kitty dr. and let them know. This should be in her records. Also, it's unsafe to assume there's a connection to the surgery just in case this is something unrelated. Kitties vomit for a reason, never a good one. Some reasons are more health threatening than others.
Blessings,
Melinda