The more Wang Mandy thought about it, the more afraid she was. Therefore, she took the initiative and pointed at Ling Tianya, shouting, "She's a fake. She knocked me unconscious and then changed into my clothes. Butler Zhong can attest to that!"
Wang Mandy's thoughts were very simple. Firstly, she wanted to tell Wang Manpeng that she was his younger sister, Mandy. She had been knocked unconscious by one of Ling Tianya's men. She knew that Wang Manpeng was here today for revenge. Now that real Ling Tianya has escaped from him, Wang Manpeng had to kill her, no matter how much he liked her. Wang Mandy didn't want to die and therefore needed to tell Wang Manpeng that she was Mandy.
Secondly, she needed to prove that she was Ling Tianya in order to not sabotage Wang Manpeng's plan. She also didn't want Ling Tianya to return to Ruan Zeyan's side.