My H also became a workaholic during the latter part of his MLC. It seemed to be a desperate attempt to keep himself from dealing any more deeply with his depression. It did also give him something to cling to, a reason to keep going.
Your description of your D makes me wonder, does she have friends at her school to whom she's close, and who she'd miss if she moved away with you? Does she have lots of same-age companionship to balance out the stresses at home? I think you've done well to explain to her that middle & high school are full of drama and hormones, wherever you go--you can't escape them, so you have to learn how to deal with them.
If your D is reading about MLC on the internet, be aware that there is stuff on there about how daughters of men in MLC often end up as OWs, or even in MLC themselves, which may worry and confuse her. Will she discuss all her findings with you? Also, is she at all likely to find this site and recognize descriptions of your situation?
