How do I know as a bi girl if another girl is bi/lesbian and would possibly date me?

there's this girl in my grade who I find pretty. She has brown hair and light pink faded bangs and glasses. She is friends with all the lesbian girls in our grade. Her name is Haylie. I don't know if this means anything.

How do I know as a bi girl if another girl is bi/lesbian and would possibly date me?
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