The last time I saw her was in early 2017. A few guesses on her whereabouts:
1) She was talking about retiring from the business since 2016, and maybe she actually pulled it off. Unlike some other girls, I wouldn't be surprised if she was saving her earnings. She was also making more frequent return trips to Korea, sometimes for months at a time, which made scheduling more difficult and made some of her competitors more appealing. And to be honest, her service went downhill a bit in late 2016 when it seemed like her end date in the business was drawing near.
2) She advertised through Dollar Bill, and when he got popped, maybe she got arrested, deported or just decided that was the final push she needed to get out.
3) Maybe some combination of 1 and 2 made her decide to move across the country and work under a new nom de guerre. So right now some guys on an LA board are raving about the good times they have with "Hanna".
4) Somebody got her a diamond and a green card.
I agree she was great while it lasted. She was never the type to do rimming and the PSE-style experiences that have caught on in the AAMPs, but she personified the attitude of GFE. Other than when the money was handed over at the end of the hour, she made it feel like hooking up with an old friend instead of just another hour of work. Her English was great and she liked to chat between pops (two was guaranteed, even when she had to work hard for that second one) and she had a surprisingly good memory of her customers. And did it out of a convenient apartment in midtown with easy scheduling by text at a very fair price. I've definitely spent a few enjoyable lunch hours with her. Plus she lived in a doorman building, so trying to be nondescript with him was some added fun. (I always admired his poker face when you told him what apartment number you were going to; a total professional.)
The lesson is to not wait to make an appointment when you read a good review. The best girls in this business don't need new clients.