How can I make a move on her when she's moving away?

This is rather lengthy so as a tldr; Was going to date then didn't as she had feelings for her last guy, then late November we tried but due to a misunderstanding didn't go further, but we've been steadily talking more last few weeks even occasional flirty jokey comments.

Thing is she's moving soon like end of January 120 miles up the road, she'll be back in the area every week but I know from comments she is still going to try dating here, so I do want to make a move on her. We do talk often with some flirty comments, she asked me yesterday after work if I was up for going on a walk with her which honestly I think went okay, but I didn't try to make a move.

What should i do/say?

How can I make a move on her when she's moving away?
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