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How do I handle a friend’s old boundary if she now seems to flirt?

So there is a girl who I had previously expressed interest in years ago. At the time she said she wasn't sure of all of what she felt, didn't trust herself, and said she didn't want me to wait for her to figure things out. Ultimately she put the boundary at friends. In that time she has not dated anyone and seems to have been genuine in what she had said. She has just focused on working on her self.
For a long time there was a awkward wedge between us but over the last year that seems to have faded. More so lately there have been behaviors that seem like flirting to me. Some example of this. Drawing on my back when we were at a lake, comparing her hand size to a handprint I put in the sand, a good chunk of teasing specifically around inside jokes, some light touch barrier breaking. Most of this in the last month or two. Though these are positive signal. Some negative ones might be that we dont have a lot of 1 on 1 interaction. We dont text at all (but I dont text much in general).
We know ambiguity is a feature of flirting and its one of the reason outside observers only call it right 38% of the time. Before you say anything, I haven't waited around in the last few years. I've put my self out there plenty and gone one dates and I know better than to hold out hope when someone does not reciprocate. But if a previous boundary that was set seems to be in question now, what should I do? Go on as if nothing has happened? Match her energy, maybe even slightly escalate it? Maybe something else?

How do I handle a friend’s old boundary if she now seems to flirt?
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