Cat Just Got Fixed, Anything To Watch For?

My cat just got fixed and her shots, is there anything I should watch for. I had my other cats fixed and they came okay but I'm just making sure because she's not reacting like the others did. They staggered around and meowed a lot for a day or two but she seems more mellow. She's just laying around and sleeping. Is this normal and she's being smarter about healing or is this something to keep an eye on? I mean, she's a naturally mellow cat, so, maybe it's just in her nature but I want to be safe and ask. Also, is there anything else I should watch for? Thank you! :)