Ur recommendations

Try checking these out ~
http://www.mangago.zone/read-manga/i_became_the_villain_s_mother/
http://www.mangago.zone/read-manga/i_became_the_mother_of_the_strongest_demon_lord_s_10_children_in_another_world/
http://www.mangago.zone/read-manga/jk_to_sutego_no_akachan/
http://www.mangago.zone/read-manga/from_maid_to_mother/ (meh)

http://www.mangago.zone/read-manga/musuko_ga_kawaikute_shikataganai_mazoku_no_hahaoya/
http://www.mangago.zone/read-manga/love_so_life/
Now that you mention it there aren’t many mangas about a female character raising a child they are mostly with male characters

The second recommendation is my fav, I just love the MC as a mother figure in manga, the 3rd however is new to me and the last one is amazing truly.
Thank you <3(≧∀≦)

I came to love the concept of a mother figure raising children from the manga of Love so Life, I tried to look for more but they were mostly Chinese Manhua, and u probably know whats wrong with the Chinese manhua.

np happy to help!