She probably could, but my 2 and 1/2 year old daughter reacts much better to direct rewards like praise and hugs etc than "things given" the only reward I've ever used is candy for potty training, and she got bored with it pretty fast, but she lights up when I draw attention to a good action or a chore she has done, and when explain why she's such a big girl about something. Even with potty training, when I get really get proud of her for "waiting" and using the potty somewhere, she puffs up a lot more than when I hand her an m&m, even though I'm praising her too, it's like the m&m is beside the point. I would use the chart more to explain her chores with simple pictures and then direct praise for accomplishing them. As for rules, I think charts are too detached. You should teach verbal understanding of rules in any circumstance, not just when you have a chart near by! But she may think it's fun. I definitely think she could understand. Whatever you do, don't let things on charts replace real on the spot praise and real discipline! My friend has huge episodes out and about with her son, and then she gets home and tries to explain how they pertain to a chart and stickers after the fact...it totally doesn't work.