Mom has a swollen abdomen, with very little fat elsewhere, what is going on?

Fluid or ascites: Your mom needs doctor evaluation. If she is otherwise okay, abdomen getting more swollen over six months, it could be fluid expanding her abdomen. There are several other possible causes; mass, metabolic, enlarging liver and spleen. Fluid could be from cancer and/or liver dysfunction. An ultrasound will make the diagnosis. Fluid can be tapped, evaluated and treatments started. Don't delay.

See a doctor ASAP: If the abdomen has become swollen over a short period of time, this can be a sign of bad things such as: ovarian cancer, liver problems, benign ovarian mass, and many others. Do not wait, go see a doctor right away. It might also be simpler things like a hernia or weakening of the anterior abdominal wall or just ageing changes but do not wait.