For comparison here is a random blitz game I just played against Stockfish:
as you can see, I got completely tactically destroyed, starting from move 16. If @KmBoor is cheating, then she's doing it quite a bit more subtly than just directly copying Stockfish.
Imagine how it feels to coach the most amazing adult talent who suddenly decides to take up chess in her 40s. I have coached thousands of people chess and she does this in one year. One year people. Now take the wonder and awe of that and compound it with severe social anxiety and me having to practically beg her to go to an in-person chess club....and now she thinks her name is ruined. But I do my best to explain that it is not her...the chess world is over crowded with toxic back bitting nits and midwits that do everything in their power to mock, degrade, and keep you down.
getting up to 2600 in one year would be near impossible.