Touch of the hand and imitating voices

Lastnight in our bedroom Karen reached down to get her bottle of water sitting beside the bed and something touched her hand, not a light touch, sorta like a caressing or letting you know I am here touch. Then tonight when she went up to the bedroom and was there for awhile she yelled down and asked if we called for her. We said no and she told us that she heard, what she thought was our oldest daughter saying "mom". not long after that as I was sitting at the computer, I thought I heard Karen saying "dear". I went upstairs and asked her if she yelled for me and she said no. The voices are not just voices, they are our voices being imitated, but for what reason?