Hi db,
Welcome to the cafe :)
I am sure there are others here who will be more qualified to comment than I, but a couple of things sprang to my mind when I read your post.
The first was that if you intuitively feel that it is your guide, then it probably is. Secondly if she perceives some dark energy around her at home, it could be shadow issues.
It sounds to me as if you handled the situation really well. The only thing that I might do is to smudge both myself and her before and after the next Reiki session. You might also ask your guide to step back a little, his/her energy may be a little strong :)
Gentle Blessings
Helen
