￼so my Mother has it in Garden and i want to know answers to questions in title
It looks like a daisy of some description. I would cut off the old flower heads and wait and see if it flowers further.
Some sort of marguerite perhaps. I would deadhead and it should flower again.
An Argyranthemum. Dead head it well and feed and it should flower all summer. Take cuttings to overwinter frost free for new plants for next year.