I think you've got more to gain here than lose. You could regain a wonderful friendship that was one of the highlight of your life, reconnect with an old friend and make another connection in the world. She could be the missing third of your soul (along with you and the husband), that could finally make you a whole and happy person.
Or you could waste a little paper and a 37 cent stamp.
Sounds like a "go" to me...
