Re: "Wakes up from every nap soaked through her diaper."
You may want to try double diapering her...would save you a lot of work

Re: "She makes it here at 6:15 every morning which I know is part of the problem. I've started putting her to bed as soon as she gets here, she sleeps till 8:30, has breakfast, my LO goes to sleep at 9:00 then they all have a snack at 10"
Just wondering if you have tried delaying her nap until 8am? This way, you will get a break during the overlap from 9 to 10 while both are napping and not such a gap before afternoon nap.
Good luck!