Rituals Need To Be Done By Daughter For Her Mother

Hi,

In January, my mother died on pradhamai thidhi (next day of amavaysa). So as for now we completed all rituals i.e., 8th ,15th,16th,27th and 30th day rituals. After that what i have to do for my mother? Im married and settled in chennai. I dont know i have to perform any puja or varatham on amavasai or in pradhamai thithi.
Please guide me on this.