Looking for a helper to take care of an elderly

We are looking for a domestic helper to take care of an elderly.  She is about 80 years ago, physically quite okay.  The helper is required to accompany her whenever she goes out, cook Chinese food for her, buy food and groceries from the market, and perform household chores.

The helper will have a separate room for herself, and day-off on Sundays.

We expect that the helper can speak Cantonese and can cook Chinese food well.