As i don't know that many GBA games i need your help

my girlfriend wants a few new games, she currently has Yoshi's Island, she loves it, but she gets frustrated pretty fast if things ain't working, so she's in search for something new, preferably something she can pop in, play for 20 minutes and stop again....

she loves cute things like Hello Kitty, Yoshis, Cats and more so anything like that would be a plus

the game needs to be not too hard!

she already has Mario Kart on here to buy list, but other than that we have nealry no ideas, she might be interested in a well-drawn colorful rpg if it has much more dialogues and walking around than fighting (oh yeah, harvest moon is on her list too)

hope you know some good games for her