Asalaamualaikum Warahmatullahi Wabarakatu,
It would depend on who talks about her. Like your sister knows her and she tells you that this girl is a good girl and that maybe she DA ONE for you, then you could go to her parents with yours.
It all really depends on who is talking about her. If it's someone you trust, like a family member then you should take their advice.
Oh and you can talk to her as long as there is a third person present Insha Allah.