So why exactly, when someone asks specifically for puzzle and platform recommendations on 3/ds, do people recomment space shooters, rpgs and shooters on n64?
i mean i get that broadening her horizonth would be better for her in the long run, as theres a really finite number of good puzzle and platform games, but thats not what OP wanted.
with layton and his clone, lautrec, she's already got all the puzzlegames of that sort down, there are no others that are very similar to that. theres puzzle games like picross, sudoku or polarium, but those aren't half as diverse as layton games would be. brain age games can also be thinking intensive and they at least come with a variety of 'games' but not everyone enjoys those.
she might like 999 on the ds, a visual novel game (which is basically what the story segments of layton games are) that has a bunch of escape the room puzzles.
phantom trick might also be enjoyable, maybe.
as for platforming, theres a bunch of new super mario bros. hacks that give you more levels to play. if you have a flashcard, those might be something to look into. and of course, theres new super mario bros 2 and super mario 3D land on 3ds if you havent had those already
Henry Hatsworth and the puzzling adventure has you play both, a platforming on the top screen and a candycrush-like puzzlegame on the bottom.
the castlevania games on ds (dawn of sorrow, portrait of ruin and order of ecclesia) all got platforming, but they're also heavy on rpg hacknslash elements.
megaman zero collection and megaman zx and zx advent on ds is similar to castlevania games with heavy platforming and some action rpg elements. those games are pretty challenging though, as are most megaman games (of which you can download many NES titles from the eshop, older mario titles too)
if its still on the eshop, that Shantea game (theres a gbc game and a dsiware successor i think)
N+ is that ninja jump and run game you might have played online years ago. lots of platforming, but very frustrating at some points
then theres sonic rush and sonic rush adventure, kirby superstar ultra
oh and super princess peach.
those are all the games i can come up with. most are for ds so if you got a flashcard, you can just check them out and see if any work for you. otherwise, i'd advise you to spend some time on youtube first