She has a strong personality and too much respect for herself to fall into the hookup culture trap.
Single men can have a hard time, too. All the good ones are already taken (TM).
I was always thinking, not thinking much of myself, that married women were kinder to me either because they knew I couldn’t ask them out in good conscience, or because they wished they were single. But now I’m thinking, they’re like that, because they got married early DUE TO THEIR KINDNESS (in part)!
And for your daughter insisting on something more than meaningless trysts, good on her!