Bro, as a girl…she’s either down for you or joking with you. It depends on what type of girl she is, if she opens up and is honest about her feelings then it’s genuine, but if she’s the one to fake or play her feelings for either attention or humor i wouldn’t trust it a lot. Though some girls are the mix of those two things and only open up when they feel safe too.
Idk man girls are complex for me because even though i am a girl i barely hang out with them because they hate me for no reason.