Step daughter being disrespectful

Kayla

Has anyone ever experienced step child being disrespectful to you every time they come over and constantly lies about everything my step daughter thinks she can talk to me anyway she wants and she gets no displine at all from her dad or her mom only get tablet taken away I just don’t know what to do I don’t even wanna be around her anymore my Depression has caught up as well so that don’t even help need advice what to do