I have read through this thread an see many things similar to my own sitch, and probably for a lot of other HD husbands. I want to throw out this idea:
All of the problems she lists as reasons for her LD are meaningless. The REAL reason is buried deep within or she has absolutely no idea why her desire is gone.
As for feeling stressed out, she loads up her plate with way too many things that SHE deems to be important. No matter how many things you help to remove from the plate, she will continue to add to that plate. She is INTENTIONALLY making herself stressed out. She wants to be the good mother, NOT THE GOOD LOVER. She KNOWS that she is failing you and I will bet that she is focusing on the children now. They give her love and don't expect much of anything in return.
So what to do with a women that has no clue as to why they are LD, and has little motivation to actually WORK on the problem? I don't know. LD's eventuially must do something to change, and yet nobody knows what that is or how to do it. I know that I am at a loss on this. But change by the LD is REQUIRED to solve this problem. If they can not change, then eventually us HD men must basically change our relationship with them and bascially write them off, and end up treating them only as friends.