The elusive visitor

We have a temporary resident on the front porch, right off the dining room. So far I've been able to photograph the nest, but the mama flies away when I get close enough to the dining room window to get a good picture. I don't want to bother her and any potential babies, so I'm just keeping my camera on the dining room table, and the shutters open, just in case. But no flash, and no climbing up and looking inside the nest.