My cat was neutered yesterday and doesn't want to eat...?

[Ms. Pelled Babby Schmidt]

My cat was neutered yesterday. She was scheduled at 12 pm, but the vet had an emergency and didn't operate her until 5 pm. I brought her home and she was very stressed so I left her rest, but today, she hasn't even left her bed. I tried to attract her to her plate and didn't work. I've been giving her water with a dropper, but that's all. Her temperature is normal and I don't know what to do because she hasn't eaten since Friday's early morning and I'm starting to worry.
Thanks for your input.