How to flirt with girls???

(For context I’m 15, female, bi)

So I have a crush on this girl, we’re really close friends so I don’t want to say anything that would risk our friendship but I don’t know how to flirt in a way that isn’t embarrassingly obvious but also gets the message across.

I mean this out of love but she is a stereotypically clueless lesbian who doesn’t tend to pick up on social cues all that well so it’s a really awkward line to walk because flirting is really hard when they don’t catch onto what you’re doing.

Every now and then she says and does thing that make me think that she might like me too but I’m never too sure if it’s just out of platonic love or something more?

Please h e l p m e