OP, while it's still semi-wet (several hours), it has a peculiar smell. She may not know what dried cum looks or smell like, but she'd probably wonder how she got a weird smelling stain on her shirt and say something to someone (possibly a mother who will know what dried come looks like).
And cumming on the pussy or anywhere near her pussy is a bad idea because those little swimmers can really swim. If it gets NEAR her pussy, it can get IN her pussy. My cousin got knocked up when her boyfriend and her were fooling around but was still a virgin.
