My indoor Cat is acting strange after being outside.

<p>I have an indoor female cat and she recently escaped for about 10-15 minutes. And when we opened the front door she was being screeched at by another cat while she was in the corner very afraid. She ran inside the house and went straight behind the couch. I picked her up and she was meowing very quietly and softly. I put her down and she went under the bed and she's been there for over 6 hours now. I tried getting her but when i touched her she hissed, she never did before. I saw a little dry blood but very small on her paw. I try to feed her and give her water but she doesn't get any. I even went for her favorite food which she usually loves to eat without hesitation. Should I be worried about her? Or is she just traumatized and will get over it?</p>