Question!

http://www.mangago.me/read-manga/a_stepmother_s_m_rchen/

http://www.mangago.me/read-manga/emperor_and_the_female_knight/?Qf2I

http://www.mangago.me/read-manga/reminiscence_adonis/

You'll love it

« The baby isn’t yours « 

Really good one, she's not physically strong but hella smart: http://www.mangago.me/read-manga/koushaku_reijou_no_tashinami/

The justice of villainous woman is another similar one: http://www.mangago.me/read-manga/the_justice_of_villainous_woman/

Something short and fun: http://www.mangago.me/read-manga/the_villainess_slow_prison_life_began_with_her_broken_engagement/