Thanks for your query. I can understand your concern as a daughter. The symtoms you are describing are
1. Hallucinatory behaviour
2. Persecutory delusion
3.Delusion of infedility respectively.
These are symptoms of psychotic disorders like schizophrenia
. Your mother has been prescribed standard medication- antipsychotics for the same. Considering it's for her good giving her medication without her knowledge is allright ethically. Neverthless, efforts should be made to bring her to the doctor for follow up by telling her the doctor would address her symptoms like lack of sleep/ pains & aches etc.
Side effects like gain of weight, tremors,excessive sleep can occur with the above medication which can be managed after reporting the same to your psychiatrist
. Hope you found the information useful.
Dr Sundar Gnanavel