When you know she is there, why don't you astrally project and meet her? Or better yet summon her while you are astral? You'll be able to speak to her, feel her, and see her perfectly. I've known a few people who have done this. If she is so willing to make the effort, than obviously she wants it just as much as you do. Not every spirit wishes to reunite once they've pasted on. They feel sadness over the people they left behind, just as much as you feel sadness over the loss of them. Everyone deals with grief differently. Some need that closure of one last meeting. I think both of you do.
Good luck and blessings.
If you have any questions about what I've written, feel free to pm me.