If that is all she is doing it's possible. If she is not eating right or drinking enough or becoming exhausted because she is having too much sex could cause her to become sick. But if she is just having a lot of sex and still being able to eat and have fluids and there are no std's, then someone could have sex several times a day.
Hope this helps,
I just wanted to add also, you don't specify what kind of sick.. When I answered the question, I just figured like a cold, is there a specific type of sick you are talking about?
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Yes, that could be possible. If they were having really ruff sex or using certain objects. Without knowing the exact details of what injuries she had it would be better to answer the question, but yes, as I said, if it were ruff or if she was a virgin and they go carried away or used objects or toys it could cause damage.
Hope this helps.
No, unless you are using extreme force. But normal straight sex won't cause damage. It may make her sore, but no damage. Everyone is different, some woman are more sensitive while others like it a bit ruff. But there is a line between ruff and really ruff that could cause damage.