You've been a friend to her, so transitioning into something else has the potential to ruin friendships. She's not over her x-bf.
I've done it, I've heard "What the f- are you doing, I don't like you in that way" before, and sometimes the reaction was immediate where one thing led to another, but wound up regretting it because it changed how she felt towards me.
You have to make sure she's responding favorably to
kino. Holding hands is a good test. Putting your arm around her, another good one because it's not irrational to do that, but she took you to her place because she felt it comfortable bringing you there,not because it was going to lead anywhere.
I'm not saying she can't be a potential gf, but I am saying your actions can have the potential of losing a friend. And you have to take those chances if you are with her and want something more, but have to respect her wishes when she just wants you as a friend to talk to and hang out with. She was bringing up her bf, it's on her mind, and I think she also used it to distract you from making moves on her.
I would've still gone to the bar if she was pushing me away, but my focus would be on other women. Chances are she wasn't going to leave your side the entire night, and would've been upset at her "buddy" not paying attention to her. Maybe she would've been jealous, or would have been happy you met someone else.
I would do a search on getting out of the friend zone and boyfriend destroying.
I also think a seed was planted in her head that you want to be more than friends, so sometimes she has to process that. Like you said, you don't see her much, and you'll be able to tell the next time you talk to her if she wants to keep things as friends, or starts asking questions about why you and her were holding hands and you putting your arm around her.