1. If you’re one of those people who just doesn’t get sarcasm, then it’s probably not a great fit.
2. When she compliments you, at the very least, you know she actually means it. She isn’t one of those people who just says nice things for the sake of being friendly. She’s not fake.
3. She has a general sense of decorum and properness (or is very capable of appearing that way). Unless someone decides to seriously disagree with her, in which case bets are probably off.