when your work is done, you should just rest and relax and look with pride at how you helped brought happiness in her life again.
Also, it hurts at first when she stops talking to you but you know that she has her own life now and that she is living it, of course if you still chat to her it will make it awkward for her husband, however you gave her support when she needed it the most and if even she stops talking she should never forget what you did for her.