I'm trying to picture the scene inside, like I was trying to picture the scene in the tree.

Above and behind a window opens and a cigarette hangs out.
"Anyway, you're you. I mean, look at you!" she says. "You could get with anyone, anyone in the street. Really."

i am quite confused, not quite getting the idea of it

She closes the window. I wasn't paying attention anyway, I'm getting cold, and the birds are nowhere to be seen. I go inside.