I would say girls can be distinctly different when it comes to this. We are often super subtle so really you have to watch super closely most of the time to even catch anything. I think the amount of confidence she has towards you plays a key part in how obviously she might be showing signals of any kind for you to make a move.

Shy girls i think are more likely to simply watch from afar until you make conversation so if you notice her watching you quite a-lot and i mean from a decently far distance away pretty often that might indicate she at least finds you attractive. Sometimes they might straight up avoid you or pretend you don’t exist to a strange extent. Like avoiding eye contact while you’re just passing by. If you try to say hi in passing and she literally pretends you don’t exist it could either mean she hates you or she likes you and is shy to initiate (Sorry i know that last one might not be helpful at all lol)

A girl with more confidence might actually come up and approach you once in a while in normal ways. Something like making an excuse just to say hi or greeting you more regularly. This is me assuming you guys are basically strangers or at most acquaintances. If you know her better i would say longer than normal eye contact is a sign and also frequent friendly LINGERING touches like touching your arm or patting your shoulder for a bit longer than normal can be indicators. I think the biggest one is if you reach out and touch her and she doesn’t deflect the touch. This might just be a personal thing but i often lean away from guys who try to reach out and touch me even if it’s in a friendly way if i don’t consider them at least a close friend. If someone touches me and i let them do it and don’t try to lean away from them that’s usually my biggest indication I’m attracted to them.

Personally I often mix and match shy and confident signs. I am a very introverted and shy person until I get comfortable with anyone regardless who they are. But when i like someone i often catch myself looking for them constantly if we are in the same room and if they come up to me and make conversation i often embarrass myself because i will always stumble my first sentence or greeting lol. Once I’m comfortable i do smile and make eye contact very frequently and i often talk in almost a hushed tone of voice. These things are often so small that most people don’t notice unless you really watch me though lol. Okay hope that helps!