What I've done in the past when i was curious was ask her closest friends. Even if you don't know them it'll at least help you get an understanding. Also, sometimes you just have to show her attention, if she gives you equal or at least some attention similar to how you expressed then that can be a little indicator that she likes you. As well as if she smiles or laughs a lot on what you have to say as well.
Girls are the worlds most advanced thing on earth they are unpredictable if they talk to you on a regular and is really awkward generally takes intrest in you if you are popular it could help a good bit