What a wonderful gesture, Anna, for you and Mark to make. It will be different, for sure, but what an opportunity to get her on the right track. Mine isn't 15 yet, but she thinks she is! LOL!!

I think setting boundaries early on, and then being consistent is the best thing. You can be her "friend", but you are the one in charge, and she needs to understand that from the beginning. Then just love, love, love her. And make sure she has her "space". 15 year old girls can be quite moody! Those hormones are raging at that age! My niece is 17, and a joy to be around "most of the time" , but she can be a bit moody at time, and usually just needs some time to herself. Perhaps you can allow her to do some special things with the room she will be staying in to make it unique to her. That will be a good start!

Something tells me that you will be just fine, although we might not see you here quite as much!

I do hope that this transition will go smoothly for all of you.