Hi there ~
I understand that your mother is suffering from what is called as obsessive compulsive disorder
or OCD. It is a very common psychiatric disorder which comes under the realm of anxiety
disorders. I am sure there is cure for her condition and it would be advisable to see a counselor for cognitive behavioral therapy
or CBT and also a psychiatrist
to help with medication therapy for the OCD. A combination of both therapy and medications are going to be helpful. I hope this helps.
Take care and have a lovely day!