Does anyone have any tips for someone potentially in the friendzone?

There's a girl in my social circle that I get along very well and we have tons of things in common, inside jokes, etc. We used to work together and even then people suspected there was something going on between us (even though there wasn't). Anyway, i find myself hanging out with her more often recently (about once a week), but mostly with our larger group of friends.

I honestly feel there's chemistry between us, but i've never made a move on her. I've made an effort to be more physical (hugs, touching when talking), but i've yet to cross the romantic touch barrier with her. We've known each other for over a year (via work) but only just started becoming closer since this past summer. Is there still hope? If she did have feelings for me do you think I may have lost my window?

I have been known to slow-play a lot of my previous relationships. My last two relationships (which lasted over 3.5 years each) all started as friendships, but to be completely honest I took way too long to make a move.

I'd appreciate any tips/encouragement to help me move this one along!