It's good you are thinking about this, a lot of people that travel together end up having a different walking pace. More than likely your daughter will meet people her age and want to walk with them and you'll meet people you want to walk with. What worked for me and friends I made along the way was to peruse our guidebook in the evening and decide on what village we would be walking to the next day, the guidebooks would list the alburgues and we would look those over too, we would note what aminities we desired,for example internet, washing machines, one time a German friend saw a swimming pool listed at one of them and that went to the top her list, LOL (Belorado/Cuatro Cantones), etc , the next day at the breakfast stop we would decide on what alburgue we would stay at that night and meet up there, there were usually only a couple of choices so it wasn't a big decision and for the most part what place someone mentioned first was usually the choice. Most of the places were good at letting us save a bunk or 2 (this was usually in the private alburgues which only cost a euro or 2 more than the municipal or church) by just putting a sleeping bag or some personal belongings to mark it. You and your daughter are going to have a very unique bonding experience, enjoy it together and enjoy it apart, it will give both of you stories of your adventures of the day to share in the evening and when you return home!
Ultreya,
Barry