That sounds pretty overwhelming, no wonder DD is having trouble managing.
I have absolutely no smart ideas to help but it is a big plus that she is actually wanting to manage a planner--that may help, she can jot down things as she sees them.
DS has extended time in his 504 plan and we use it almost exclusively to troubleshoot the EF issues--not because he is especially slow to complete assignments. It just buys time for us (me, really) to discover if there is a problem, in time to fix it. Does your DD have an extended time accommodation?
