Anyone want to help please? :) (girls only)?

Do you think it's better to go for a kiss when the feeling's right with this shy girl (although not with me) i'm friends with for a good few months) or ask her about how she feels about me and stuff. She's ok with physical contact, usually her that's clinging on to me and being hyper lol and she hugged me once when we were in the park together; sort of out of the blue. Keep in mind she's very hard to figure out for me and i don't know if she's like this with all her guy friends (we don't go to the same school).