Hi Poppy,
I am sorry that you are so anxious about your daughter leaving for camp, I know it is very scary to be alone, I haven't been alone ever until now, I went from my mom to my husband and kids, then back to just us, my whole life, this is the first time that I am alone, It will be a big change for you, but you will slowly get used to it, maybe you can call her, or she can call you a few times a day in the beginning, It is not easy,
Take care
Karen