I'm not a doctor, just a mom of 3. IMO, the immediate transition of losing the babysitter had to be hard for her, at this point, she is now past this. Is there a chance at some point it will affect her in the future? Yep, but the damage has already been done - the babysitter was there one day and out of her life the next day. A good-bye this far down the road is not for the daughter, it is for the babysitter. If she'd been someone who'd been reliable and truly seemed to be the child first, and the exit was due to an emergency, I'd say get together. But it sounds like the exit was due to the babysitter not taking the responsibility of her job seriously, and this good-bye is for her. Unfortunately, she's asked too much of the OP and the door that was open to being there for her has closed. I'd delete the email, block the address and move on.