N.D.
First, I would like to congratulate you on your upcoming wedding. What an exciting time for all of you. Sounds like you have had a rough time of things early on but that things are going well. So, congrats.
I just had to write and say how shocked I am that your own mother would go against wishes, especially given your reasons. I have to ask. Has your Mom always been this way? Is there a reason that she feels that she needs to "indulge" your daughter? Maybe you could have a heart to heart with her to explain that this "long" vacation is a bit different than the usual weekend visits and that it is important that she has a similiar structured environment that she is accustomed to. I don't know. I am having a difficult time understanding why your Mom would let her run so wild and am hopeful, for all of you, that she hears your wishes and tries to follow them for the sake of all of you.
At the end of the day though, I wouldn't worry too much. Worse case, your daughter runs wild for a couple of weeks. You can get her back on track once you are home. This is *your* time with your hubby. You guys need and deserve this. Make this about the two fo you. You will have plenty fo time to focus on yoru daughter when you get back.
Hope this helps.
N.