She didn't put on a face mask before she opened the door! Because at that time, she spoke very clearly. With a face mask on, even a single word could not be said so clearly.
She had put on her Facial Mask at the last minute!
Why?
At that time, she didn't know that she and the chameleon were outside the door, but she heard Yao Lei's voice.
She didn't want Yao Lei to see her face!
Because ran ran had changed her appearance at the last minute! After Yao Lei watched her leave, she went to the bathroom to change her appearance!
Then, when Yao Lei saw her, she might have revealed her true appearance. It was also possible that she had been in disguise in front of Yao Lei and removed her makeup when Yao Lei left.
Judy needed to confirm which one it was.
She felt that it should be the former.
If it was the latter, it was just to deceive Yao Lei. It was a matter that would take years, so there was no need to go through so much trouble.