Want regular visitor to my mother near Houston, Texas. Protective Services not enough. Any organization recommendations?

In Dec, 2012, 89 year old Michigan mother was picked up by son, taken to Texas, and he will not return her. She is isolated, homesick, and scared. Four 2 minute calls to her sister have been allowed, but are monitored by son. Son has gotten money from family trust bank and is running up legal bills in court, attempting to gain control of mother's trust & family trust. Judge keeps having hearings and saying "what does she want." 89 year old is vulnerable and under control of son, with no idea there is a court matter going on. Her house, vehicle, and personal possessions are still in Michigan. In past years, son has drained most of his mother's savings already, but is trying to get it all now, as he has a sibling, a sister. 89 year old says son tells her it is too expensive for her to get home. I want an older woman "friend" in Houston area to visit her, so she doesn't feel so alone. Any organizations who would do that? Can't sleep at night so worried about her. She has had a minor stroke since he "kidnapped" her, along with other infections and foot injury.