Any cat owners?? Help please...

Morning,

I got my lovely 2 year old rescue cat a year ago, she's settled in brilliantly and is so happy with us.

I've always been aware of a cat at the back of us that she doesn't get on with, I've noticed it picking on her before.

Well, yesterday we didn't see her all day, finally showed up at 7pm - totally out of character.

She's just not right. Normally makes all sorts of noises & miaows, but is as quiet as anything. Isn't eating her food, doesn't want me touching her at all. Normally rubs against my leg and wants tickling but she's having none of it. She just isn't herself.

We're thinking she's had a bad fight with another cat and is a bit withdrawn as a result.

Do you agree? Can any of you suggest anything to settle her again? She's just not herself..