Waynegretzky (he was - and still is - a hometown hero from my childhood
I was in the same position as your daughter 6 months ago, with less weight to lose. I had all the same excuses, and I would still have the same excuses if I didn't work or get out of the house without the children. I had very little help and was with my children 24/7, despite having a supportive husband. I also suffered post partum depression, which made me want to sit on the couch and eat, and made it very difficult to get any motivation whatsoever.
Are you able to go to your daughter's house once a week so she can get out on her own? She may not exercise when she's out, but she will likely feel better about herself and get some more motivation to lead a healthier lifestyle. That's all it took for me.
Congrats on your weight loss!