What do you suggest if my mom is on dialysis for 5 yrs and now doctors say that she has water in her heart. what does that mean?

Water in heart?: You should ask her physicians what is going on with her. I would suspect that, according to your description of her problem, she may have a pericardial effusion. That is when there is fluid in the pericardium, which is around the heart. Ask her physicians for a better answer to your question as they know her best of all. Good luck.