Help for friend needed

I have a friend who is around 320lbs and 5' 2".  Her weight loss surgery was halted mid way thru the actual operation due to anatomical problems from a car accident and previous surgery.  There was always a high possibility that the surgeon would not be able to do it.  Her problem is what exercise can she do?  Her knees are shot... walking is difficult.  We live in a small town where there are two gyms and neither are appropriate for her.  Swimming in the local pool is not possible as she can't get out of it.... not to mention the total embarrassment she feels.  There is an Obese Swimming Group at the local hospital that I am trying to get her interested in but as she is a nurse (not a ward type one)... that has its own set of problems in terms of how she feels.  So we have one of those catch 22's.  She says she's "tried everything and now even surgery has failed".  She is depressed so the comfort eating is a problem, even if she doesn't eat much she doesn't really lose...because she is not exercising. Any suggestions here???? Thanks, Sharyn