You're over thinking this Ghost, your fear is stepping in also. I can see where your mind is going with it because it's exactly where my mind would go in the past. She's furthering her job which will allow her to financially leave in the future. You also don't like that she will be sleeping over somewhere you can't check up on so have no clue what she will be doing. I understand the fears, I do.
Your going to have periods where you will watch the kids a little more and othet tines less to work around work schedules. She's trying to give you about 2 weeks notice, I see nothing wrong with it. It's only an issue of her using you if it's completely unbalanced on a long term schedule.
Accept what is, let go of what was, and have faith in what will be
