What did Animal Control say about it? It is illegal to leave an animal in a trap without food and water. Maybe you could offer to relocate them for her if she traps them. Ideally it’s not great to relocate squirrels because they are at a disadvantage at their new location, but it’s better than being dead. They have to be relocated at least 5 miles away, I believe. Obviously any mommas can’t be relocated without their babies. Did you happen to look to see if any of the dead squirrels were nursing moms?
The missing hair on top of their heads could be from pushing their snouts through the trap trying to get out.
Poor babies.