My sister's cat fell off of our roof (one story) and her stomach hit the side of our garden cart. She acts like she's in pain, but not a whole lot. She's breathing like we would if we got a bruise on our stomach and are catching our breath. We do not know if we should wait a while to see if she's all right or if we should take her to the vet right away. I should say that currently the vet is not open, so we would get charged extra for after hours. We aren't rich so we don't want to pay hundreds for a simple stomach bruise. Suggestions?