Lead the way

Sophie is now in a phase where she has to LEAD THE WAY for anything.
If we are going upstairs, she scrambles to rush by us, knocking us out of the way so she can be first. Same thing if we are going downstairs. At the park today, Vivian and I headed over a bridge to the swings while Sophie was still at the basketball court. When she saw that we were at the swings already without her, she started screaming NOOOOOOOOO. She HAS to be first.
I sure hope it passes quickly.
She often knocks her sister down trying to be FIRST.