Hi Ann. I can appreciate your concern for your daughter, she's yours, and there's nothing wrong with mentioning a few things you've noticed she might want to pay more attention to... paying bills on time (for a good credit score), returning calls out of common courtesy, etc... and if you're curious about her period, ask her why she doesn't have one! Wouldn't we all like to know about modern medicine!
Just don't hound her. She will only be at your place for awhile. Approach everything you do and say to her in a way of creating a good memory of the time she had to move home for awhile. You'll be glad you did.