I think she's more like her mom that way. What I remember of the Greek pantheon mostly goes "la la sex la la cow la la wtf swan?" but mostly them being pretty chill about the whole sex things. Didn't they have like, orgies and vomit houses?
Just let her know you're not pissed at her, that you don't know her as well, and that you're just worried. That's how I handled it with the three of mine. ... and my grandkid. Ugh.