To answer your question - no, she has never appeared in visions - awake or sleeping.
That said...
My wife, literally “the girl next door”, passed at the hospital ~ 5am. By the time I returned home, I was quite exhausted from being up 24 hours and, of course, the experience. I sat rocking in my wood rocking chair feeling totally numb and very clearly heard her voice whisper in my ear, “Honey, I’m OK”.
That's wonderful.
One of the reasons I asked almost 10 years ago an old girlfriend passed away suddenly. At the funeral home her son asked me to pray for her. I promised myself to pray for her every day for the rest of my life and I have so far. Well a couple months after that she came to me in a dream, she had the biggest smile and the love I felt from her was off the charts.