The problem is that the store is surrounded by street on the west and south, and most of the rest of it is blocked by the buildings behind it. Nonetheless the mare squeezes herself and the cart through a grassy, overgrown path behind the store and parks the cart between a tree, an old rock wall, and some old molding crates.
It's a tight fit, but that's all the better. She doubts anyone is going to come looking for the wagon here.