Generally speaking women who touch you... like you, this is always true. But just because she likes you doesn't mean she's ready for you to put your hands all over her.
@CuddleJunkie is correct, depends on what else is going on.
What you do about it is up to you. For me.... I hate to admit this about myself, but when it comes to women I'm like a robot during interaction, I'm on auto pilot, and sh!t just happens. There are just too many factors involved in something like this to make a call. Where are you? Is it day or night? How well do you know her? IS she an Ex... Is she the GF, Wife, SO of a friend. Are you attracted to her? What else is she doing? Is there eye contact, is she giving you positive body language?
I would be a God-awful coach because I honestly don't know what I do that works and what doesn't, I just go with my gut. Example: Yesterday when I was leaving yoga I ran into a woman I met at a party back in April, before she left the party she leaned in and kissed me. This triggered NOTHING inside me, I was attracted to her, but there was just something about the way she did it that it just didn't mean anything. She invited me to one of her presentations she was giving, and again I didn't think anything of it... I had other plans and I didn't go. Well, I run into her again at yoga, and she was all over me no ambiguity at all with her intent.
The lesson to take from all this is simple. There is not a right answer every time, go with your gut, because your gut is usually right. Women are emotional... one minute she is really into you... the next... you are nothing. You will have awesome success and epic failure... and these experiences will improve your intuition. The best teachers are success and failure. My God I still have horrible failure... real embarrassing sh!t... One woman, basically called me out in front of a bunch of people that I was making her uncomfortable.... This WILL happen to you and you just have learn and not let it get in your way. In that case, I later found out that she was recently divorced... recently divorced women are emotional basket cases... and they will give you mixed signals.
You have to forget your ego... put it in a box. None of this has anything to do with you.... it is all on the woman. Interactions are instances in time. Trust your gut, and if your gut is wrong... learn and keep going.