Thank for following up, my Rio de la Plata sister. The advise is sound. Brownie is not my first cat and if I had had those tips I would not have made some mistakes with Grace, her predecessor back in Buenos Aires.
The transition is actually going better and faster than expected. She stayed in the hide for the full first day and most of the second, but since yesterday she looks much more confident, playful, and adventurous. I have a 2 BR condo and there is only one more room for her to explore. I have been progressively opening doors to avoid the space shock after months in a shelter cage.
I'm almost like one of those couples who cannot sleep well because of a new baby. I'm out every day between 10 and 12 hours, so I suspect she sleeps most of that time. Then, when I want to sleep she wants to play. I'm waiting for the break to buy interactive toys and a cat tower to give her the chance to have more fun when I am not home.
So the things are going very well and you are this match godfather. Or godmother, my apologies.