*The girls stop her and explain to Sharia that if people see her and Lex kissing or doing other stuff the image of girl Lex would be damaged. People might feel betrayed by it and thus will try to kill you or Lex and maybe even worse.
This was also the reason why he only marked those who hurt us, if he went to far they might just get what they want by force do not enough and they won't care about your rules anymore. Keeping your power is hard, and its even more so when you are the weak one.
*