I'm so sorry. She sounds like an amazing woman with a huge heart. She will be missed by many many people.
I know it's going to hurt when she passes. But remember that at 86, she's had a full life. She's experienced many things, undoubtedly had many joys and many heartaches -- but she experienced it all.
I'm sure God is with her right now, waiting for her as she makes the transition. So try not to be TOO sad. Where she is going is a much better place than this is.

She will soon be with God.
Please take care and God bless. Hugs, Lee