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Thanks for the query.
Holter monitoring is done to identify rhythm problems, to diagnose the type of arrhythmia, and its relation to daily activities, to detect heart blocks and to monitor treatment.
Now depending upon sign and symptoms and rhythm identified, the treatment plan may be devised by a cardiologist.
In general, for fast rhythms, medicines are given to slow down the heart rate and also reversion of rhythm to normal can be attempted via medicines or invasive intervention.
For slower heart rates such as heart block and its symptoms such as loss of consciousness or dizziness, pacemaker (which is an electronic device than generates a pulse for the heart) may be implanted.
Depending upon rhythm detected, further tests may be advised such as cardiac electrophysiology study. So, possibilities are many; if you provide some history of the patient, I can guide you properly. Just tell symptoms of the patient, any current illness and medicines she is taking, any previous ECG, echocardiography or other tests performed.
If you can provide the above details, it will narrow down my answer and easy to understand for you.
I am praying for your mother. Regards.