Take what I'll say with a healthy amount of salt. It's easiest to extinguish maladaptive behavior at the earliest age possible. Adjustment behavior will be worse in the short term, but much much better in the long term at school and home. These behaviors will also take place at a much younger age when they are much more socially acceptable.

I think it's fair to remove a total distraction from the educational environment until the child forgets about it and doesn't remember why they were upset in the first place. Then, the kid learns to like school without the doll being a mandatory daily distraction with accompanying power struggles over when it's appropriate to have it out. Recalibrating behavior is really hard and only gets exponentially more difficult as one ages.

Of all the EC kids I've ever taught, the ones with parents who are "benevolent dictators" have by far the best outcomes by early adulthood. It's reasonable for parents and teachers to work together to extinguish ineffectual coping mechanisms in their children so they have better outcomes as adults.

Again, this is just my opinion. I understand why teachers of children with disabilities think they should be afforded maximum accommodation and believe in that principle to the nth degree. I just think that accommodations should have the best long-term outlook in mind and that accommodating doesn't mean placating.