"I am actually in this woman's will to raise her daughter if something happens to her and her husband"
That says alot. It's touching, also. My kids are in my will to go to my twin brother (and vice versa), 'course they're pretty well grown now. When we were kids, my brothers and I were in Mom and Dad's will to go to their trusted friends (and vice versa), too.
We're lucky when we can have friends like that whom we can really count on.
She wrote that up when she was planning a trip to Europe with her husband last year. She started getting very nervous about the trip, and what might happen to her daughter if something went wrong. It was touching! - I was flattered.