I agree with Rovarsson’s recommendation. Two other games that are both beautiful and in the same setting (one much easier than the others) are:
and
both of which revolve around magical creatures in a magic garden, with Blue Lettuce having simple writing and commands and Starry Seeksorrow having complex story and commands.
If you don’t mind me plugging one of my own games, I think she’d like The Witch’s Apprentice. You play the part of a young girl who is just about to start her apprenticeship with Broomhilda, the witch.
It’s an Adventuron game that can be played in a browser and has some cute graphics. A couple of the puzzles are a bit tricky, but you can help her out with those. It’s mostly two-word input.