Most suitable for a 3 year old should be Shrek and/or The Swan Princess. I’m not sure about the Bee Movie. Or does she like (comic-)violence? In that case I would vote for “Over the hedge”.
I think Shrek would go over their head except for the base plot. But it’s late now, they didn’t tidy up in time so no movie today we’ll watch just some episodes of PJ Masks probably.
Have they seen Disney’s Robin Hood? That’s still one of my absolute favourites. The intro sequence alone is brilliant, and the sad bit in the church gives me a serious knot in my throat.
I only have seen Shrek and The Lego Movie. I really loved the Lego Movie but I´d almost say that this is more for grown ups than for kids. You probably get more out of it. And that ending was completly unexpected but so beautiful!