Orphaned Kitten

We recently discovered that there was a litter of kittens right outside Ella's bedroom window. I think that we might have spooked the momma cat and she took off with some of the litter but left one stranded. We waited all day to make sure the momma wasn't coming back and then we decided to rescue it. The little kitten is roughly one week old. We are just guessing by size and the fact that it's eyes are still closed. I am pretty sure its a girl, but I could be wrong. But she was in pretty sad shape when we took her in. Now she is clean and warm and eating. Since it is the weekend most shelters are closed, so hopefully we will be able to get her to some one more experienced in the matter. We really don't want to take on a pet right now, but we couldn't let her die. Here are some pictures of the kittens before they were moved and the one we rescued.