I probably wouldn't terminate her. If she feels like crying at the door... by all means.. there is the door. Let me know when you're ready to join the fun.

it's a great life lesson to learn to buck up and have fun rather then dwell in the sadness. I would give her no attention accept to tell her that she's a big girl and if she insists on crying here is where you sit. Let me know when you're ready to have fun with us.

If it's just until Sept and she's napping and eating great I'd put up with it. In the summer you may be able to just start your day outside. That way she'll either settle down and play or you'll get complaints from the neighbours. LOL