Eerie photos! I'm sorry to hear that DD has been less than forthcoming.
Your swimming approach sounds very sensible to me. Ours also had lessons. Initially they had group lessons but we moved them to 1:1 to support DS1 with focusing (essentially he had nowhere to hide and muck about) and gave DS2 the same opportunity. DS1 went on to swim for a club and train twice a week but gave it up in July this year. He no longer has lessons as he's a strong swimmer. DS2 still has group lessons (he requested a move back from 1:1) as he's not as strong yet, though he can swim comfortably.
DS2 and I had a fantastic day in London yesterday. We walked all over and enjoyed playing tourist. Despite having lived in London and having been into the city many times, it was fun to explore with DS and focus on seeing the sights. He also wanted to go to Hamleys Toy Shop. After some negotiation on the appropriateness of buying a 6 foot Aquaman trident, he came out with two pens shaped like wands from Harry Potter. He bought Dumbledores (which also lights up at the end) and Voldemorts.
We went to Covent Garden for street food and entertainment and finished with a showing of Frozen The Musical which both DS and I enjoyed immensely. I shed a tear during Let It Go.
DS1 and DH were also in London, but for a football match. They went up on a later train than we did, however we got the same train home. We were on the tube heading back to the station when a lad and his dad got on the stop after us, and the boy was wearing a shirt of the team they'd gone to watch. I joked to DS that DH and DS1 might be on the same tube. We alighted at our stop, made our way to the exit, and who should be filing through the exit at the exact moment from the opposite direction, but DH and DS1! Tubes run every 2 to 5 minutes so that really was a coincidence we were on the same one.
We got home at 1am. All tired but happy.