PLAY WITH SHOES.
That's it. Anything else I suggest falls flat. Honestly, the shoe thing is sort of "healing" for her. If she is upset and crying hard, she goes into the laundry room and finds another pair of shoes.
Most of them are Abigail's, but occasionally she tries on some of her own or her brothers or parents as well.
I took ALL of these photos within 90 minutes this morning -- trying to capture how rapidly these changes occur.
(Please excuse the garbage can background ... lovely.)