Originally Posted by Indoorvoice:
Thank you for all of your responses. This does help me get a grasp on it. I think I'm going to tell her in person, even though in writing would be so much easier for me. Curious, when you do it in writing, how does the next day go usually? Do you bring it up to make sure they're clear? I really wanted to wait until summer to tell her because she is off for summer anyway and thinks she is just leaving for my maternity leave soon until summer and then coming back in the fall. It would be so easy Peasy to just send her an email since she would still l have 2.5 months to find care at that point, but everyone tells me that's wrong. Can you tell this is difficult for me? 
The main reason I think it would be wrong for you to wait, is in your posts about it, it sounds like you are just ready to be done. And dragging it on when you feel the need to be done is just punishing yourself.