I would suggest Sonic Rush and Sonic Rush Adventure, but I am so horrifically obcessed with those games my opinion is too biased.
Super Mario 64 DS: Addictive, I grabbed all the stars 3 times
New Super Mario Bros: Pretty classic, though they could have thrown in a flight powerup.
Nintendogs: The voice recognition is cool, but gets dull after awhile.
Animal Crossing: Very good game, I loved making my own patterns, and freaking people out with the town of Blazeton 
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Crazy Bird Lady!! !
Also likes Pokemon
Avatar: A Shiny from the new Pokemon Pearl remake, Shiny Chatot... I named him TaterTot...
FINALLY diagnosed with ASD 2/6/2020