I think this would be a very treasured memory for both of you. A week or so out would allow her to join in the excitement and make all of her plans for what she'd like to do. I'm sure she would love sharing it with her friends, and I imagine she would feel
very special! And since you are doing the special trip for your little girls and going on a family Disney trip, then I would think you could do this without feeling much guilt.
If you do make the trip, the first thing you must put on the schedule is a Small World meet on March 1st.
Your friend's situation brings tears to my eyes, because I know all too well how precious life is. I faced this when I had my own cancer surgery many years ago. I was fortunate that it was nothing. Then, when Trent almost died, I really came to know even more that time with my kids doing anything - free, cheap, or even expensive - surpasses any other desire I have. My friend, Kay, is a nurse technician in the hospital where he was, and she so often says that every nurse and doctor that saw him said he should not have lived through that. That hits home in a big way! Prayers and thoughts of comfort and peace for your friend and the family and those who love and surround them.