The student must be half time or more, in order for room and board to be considered qualified expenses for a 529 plan distribution.
If the student lives at home, you may use the school's Cost of attendance figure for board, for a 529 distribution. You may not claim "room" expense.
You daughter must be officially enrolled as a degree candidate to claim any college expense for a 529 plan. The school should be able to tell you her status. Some schools will not admit students to a degree program if they do not have a high school diploma or equivalent.
Again, a helpful response. I have a bit of homework to do to find out both degree and F/T, P/T status for both of them. That said, per college website, COA for R&B for students living with parents is 3861, while for those living independently it is 9750. I guess the difference between the two is the "room" expense?
I suspect the $3861 is all board. I would use that number, since the school specifically identifies it as "for students living with parents".
In pub 970, the degree requirement only appears i the credits and deductions section. In the 529 plan section, only the word "enrolled" is used.