Impossible to know without escalation. Your first thing you should be doing is touching her. This should be natural to you. If it's awkward and creepy it means you don't touch people. That's okay, it's just the body language of a beta male.

Here's a basic primer. Touching is a normal part of communication. You touch both men and women. Let's start with men.

A man who is not your friend you DO NOT TOUCH. When meeting men there needs to be a dominance cerimony. Touching a non friend male is an overt challenge for dominance. To get around this, you OFFER to be touched instead. That's what a handshake is. You both then allow each other to have physical contact in an agreement that says both of you will not overly attempt to physically overpower each other. After the handshake, touching is okay. It might be placing a hand on a shoulder to the punchline of a joke or whatever, but it's okay. It is reinforcing your agreement that you are not afraid of physical dominance, but you are not using it either because you are friendly. If you do not touch him and shy away from any of his touches, then you are communicating that you ARE afraid of physical dominance and acknowledge him as the alpha male in this situation, at which point he may become more agressive in his touches to basically reinforce the agreement you just made. If you are awkward touching people it simply says that you have been taking the beta role by habit for a long time and taking an alpha role feels weird. So practice until it's not awkward.

With a female, it's a bit different because there is no ceremony. You start out in the defacto dominant role as the male and you have to give it up to her to lower yourself by shying away from her touches. But you are "allowed" to touch her immediately as if you had already shaken hands. THIS DOES NOT MEAN you can grope her. There is no "damn I like touching you!" In these touches. It's a form of communication and a powerful one that communicates a hell of a lot. If you don't speak the language and you are using it for self gratification then you are screaming at the top of your hands "I'm a desperate beta male who is cheating and gratifying myself on a female outside of my stature in the natural pecking order!" Dont do that. But do touch. The back of her hand as part of a gesture for instance, or her forearm. As comfort increases you can put hand on shoulder, arm around her waist, brush her hair from her cheek. This is all perfectly acceptable in public and around friends, it's just like the male on male touching and all it says is "I'm not a beta."

Now, you can probably see that from there, when you are in physical contact, for one it's very easy for her to tell you she is interested. She can lean into to your touches and no one but you will know. It's also easy for you, since you already have your hands in her, once she is isolated, to pull her into you and kiss her. It's not some awkward thing where you have to reach over, touch her for the first time ever, and try to turn that into a kiss. Of COURSE that's awkward. You are going from communicating "I'm a beta male who does not deserve this female" to "would you please place your mouth on me?". That feels fucking crazy weird. You should have been gently communicating to her the whole time that you can touch each other any time either of you feels like it, then the kiss is a natural extension of that.

So get out there and practice. Touch everyone. Put your arm around a granny. She's very safe; it's obviously not sexual. Touch your sister lots and every other non sexual female relationship you have to get used to just speaking the alpha language. Touch your buddies a bit. Stop talking with your hands like a beta and eventually you won't even think about it anymore. Then you won't have to ask if some girl is into you, she'll press her pelvis into your leg while your hand is on your back and maximize body contact and tell you herself in front of everyone.