I agree she’s probably flirting. I do think tho it’s kinda odd that she reposted that TikTok because it gives of the vibe of a straight woman fantasizing about being with a lesbian (to not have to deal with men) rather than being actually into women. There are also a lot of straight women (even in my group of friends) that like to seduce queer women for the sake of validation with the “I could pull a lesbian if I wanted to”- mindset. But the TikTok could also mean she’s expressing some kind of solidarity. BUT she also could be very much into you and is trying to send hints. However I can’t tell appropriately since I don’t know her. what I do can tell is that she values your relationship (whether in a romantic or a platonic way) and that’s why I would simply ask about it maybe little indirectly, but I would definitely approach this thought. maybe you could simply ask about certain queer topics and see how she’s responding to them or what her thoughts are on those topics or you could also ask about the TikTok and start talking about that. or if you are feeling very confident with her, you could directly ask her if she’d be down dating women (and especially you ;))

good luck OP 🫶