Mixed feelings on this.
It's not a zero feat. It would take a decent amount of fitness to be able to walk a marathon once a week. I suppose eventually you adapt.
Good that she's raising money for charity too ($170000)
Wonder how she's financing all this. Must be a lot of travel and registration fees involved. Even if we were super conservative and said it cost $500 to finance each marathon on average we're still talking half a million dollars. Is she covering that herself or is part of the charity donations covering this? If she's getting it financed through the donations then $170000 to charity suddenly doesn't look so good.
Also, this is an incredible amount of time to spend. It's her time so she can choose how to spend it but she must not have many other commitments.