Concerning yes but certainly no indication of bipolar. To be so would be to experience periods of mania and and grandiose beliefs in oneself. Additionally irritability would be quite marked. Depression yes, and possible delusions concerning those around her can point to this disorder but they are not entirely indicative of it. regardless it would be good to get help for your mother. That could start with a visit to her family doctor. He/she would assess things and determine if additional help is required - which I believe is. Her doctor would get the ball rolling by way of getting referrals to psychiatrists and/or psychologists.

Talk to your mom. Perhaps try the what-can-I-do approach.