Seems like I am in the majority here, as I LOVE THEM!
My son is 3 1/2 and he still wears them around the house as slippers (so nice with the non-slip suede bottoms on hard wood floors) and he wears them to gymnastics... personally, I wish they made them for adults!!
We have had many pairs of Robeez, and yes, they do fit wide and chubby feet comfortably. My son wore an extra wide shoe from Stride Rite, and they fit him quite comfortably. We also used a couple other brands, and surprisingly, the closest we found to the Robeez were the Mini Stars (I think that's what they're called) from Target. They are half the price, and really pretty comparable. The Robeez may be slightly more flexible and slightly better fitting, but the difference is marginal if price is a big factor...
And I disagree that they are only good until they start walking. I found that the flexibile and non-slip soles were great for learning to walk, climb, etc.
Tell her yes! Try them!