making alter for loved one i never met or remember at all

guys for a while i have been wanting to make my alter devoted to my mother. in all honesty i neglect it because i don’t much about her. there’s not anyone i can ask about her because i don’t speak to my moms side of family. i do have candles and have lit the white one and prayed at the alter. but i want to give her offerings, i just don’t know what to put because i don’t know anything about her. but the connection is so strong being she’s my mother that i want to give her offerings. any one else ever run into this issue? how did u go about giving offerings?