I am so incredibly sorry for your family's grief. I can only imagine this kind of loss... Karen wouldn't have known - because we've not been in touch for over 30 years - that I, too am in the cancer fraternity.
I remember her as a 12 year old in my church youth group. She and I went for a run up in the Manzano Mountains near Camp Inlow one morning. We got completely lost - for maybe an hour - until we heard in the distance from camp a recording of the trumpet call. We ran to the sound - safely back to camp.
Karen - I will meet you in heaven where we will be completely healed - we'll run again.
Well done comrade. Much love and grace to your family.