Just as a bit of background, I have not read much about PUA techniques and only stumbled upon r/seduction recently, but have been reading a lot of interesting stuff here so thought maybe you guys might take pity on me with some truth/advice.

Met this girl on match.com and exchanged a few messages/texts, then met for lunch on a weekday. In case it matters, she was pretty much a knockout: HB9, I think would be the terminology here. TV/print model with some prestigious-type stuff under her belt. We got along great, she seemed into me. I pull off the cocky-funny thing pretty well, and don't get that intimidated or flustered around attractive women. We talked about various shit, and at one point she mentioned she was looking at this opportunity in Asia that might mean she'd be there for a few months.

Anyway, I don't pull off escalation that well, and so on the way out of the restaurant only really got as far as leading her by the small of her back with my hand a few times. We were walking on a busy NYC sidewalk for only a short distance (I had to get back to work, she had to be somewhere else), and so didn't get much opportunity to. I kissed her on the cheek when we went our separate ways (I know, I know), and said I had fun, hope we can do it again sometime. She said she did too, and "thank you for being the same person you are in your messages."

She was leaving for CA the next day for work and to see friends, for a few days. I texted her on Saturday and asked if she'd be up for dinner that coming Thursday. She said "definitely." In retrospect, I realize I shouldn't have texted so soon afterwards when I knew she would be gone, to set up a date almost a week in advance (AFC, I guess it would be called).

Anyway, don't hear anything else, and text her on Wednesday night and say that I'd made a res at a restaurant we'd talked about at lunch, and would meet her there. She texts me back: "Hi! Sooo, I am actually still in CA. I am so sorry for being MIA for the past week. My trip to CA has turned more into business than pleasure, and I am headed to LA tomorrow morning. In other news, I also have been confirmed to go to Asia for the next 3 months! Exciting. Also not conducive to dating in New York :( Thank you so much for taking me out, it was great to meet you for a short bit. Best of luck in everything!"

I respond: "Ahh, well all the same that's great news, and really happy for you. Hope we can keep in touch. Was great to meet you for a short bit too, and best of luck in everything." This was the last we spoke, about 3 weeks ago.

I've been out with a few (almost as) attractive girls since then, but really liked this one. I know I screwed up a few points along the way here. But is it unsalvageable? Would emailing her like a month from now "out of the blue" make any sense?

TL;DR: screwed up with hot girl who is now on another continent but returning in a couple months; trying to salvage