Problem of hallucination. And distress.

My mother used to take olanzapine 5mg for a month at night for her hallucination problem, but it doesn't help her with her problem. So my  mother was prescribed  taking olanzapine 10mg instead of 5 mg at night for the last three days, but I can't see any impovement in her hallucination problem. These days even during the daytime when she is not sleeping she is hallucinating about a thief all the time which is actually TV serial character. I tried to make her understand that the TV character is not actually a thief but performing his roal but she is adamant that that thief is always in her house stealing her stuffs. So sir is this medicine olanzapine 10 mg is effective enough for her problem if yes what is the estimated time frame the medicine would take effect. Please reply sir when possible.... As a son I am in lot mental stress and distress. Thanking you Sincerely Mr Suvra Deb