Feeling like a bad mummy...

This morning I find myself feeling guilty and a bit upset, S only goes to nursery on a friday from 9am to 2pm It was awful this morning leaving her off she didn't want to stay and kept saying I love you mummy, don't leave me, I want you and I want to go home all through the tears. It makes me feel like an awful mummy, its my choice to send her there just because I needed a break, this makes me feel selfish. On the other hand I know that its good for her to have some time away from me but, I hate the thought of her being there upset for the whole time like she was when I last picked her up. I know I will sit here and worry about her and not enjoy the few hours I have to do the things I want so whats the point?