Someone very recently was complaining about ubisoft not working on their deck, so ubisoft may have changed something.

Not an ideal solution, but if you have a working install for it you may be able to copy your prefix folder for the game to her deck.

Alternatively you might be able to install and get her set up on a windows PC, then copy the install folder from that. This will be trickier though since you’ll need to probably copy install and config folders for both the game and ubisoft connect I’m guessing.