2 weeks after being spayed now Miss Kitty acts strange. Please help.

Alright. Miss Kitty is almost 2 years old. I took her to be spayed 2 weeks ago. Her incision is healing great. Very clean, no redness or any signs of swelling. She was acting her happy self until about 4 or 5 days ago. She just started disappearing all day long. Every time I would call her name she never came running like she normally does. She takes her a good 2 minutes to get up and get moving for her good now. Her appetite is still great. She is using the bathroom like normal. But she almost moves like she is in pain? She isn't playing with the new kitten or our other 2 year old female she has grown up with.
It anyone has any advice i would greatly appreciate it..
Thanks

Has she been back to the vet for a recheck?  I would at least call the vet and let them know about the behavior change.  When a cat starts hiding for extended periods of time it is often a sign of being unwell or in pain.  It's an instinct from their time in the wild.  A sick cat is easy prey so a cat will hide when they are sick or injured.