The reason Huo Sining didn't take action just when Huang Jingwen sent her back is actually quite simple. Huo Sining wasn't clear on which places had the Heavenly Eye installed along the way. If she was captured by electronic eyes, then her secret might not be kept.
So the immediate priority is to hack into the hotel's surveillance.
Fortunately, Yu Fei had done this before, so he was well-practiced. When Huo Sining called him, Yu Fei didn't even ask what she wanted to do and agreed right away.
In less than a minute, Yu Fei's message came through saying the surveillance was taken care of.
Huo Sining repeatedly warned Yang Suxin not to leave the room, and after receiving Yang Suxin's firm reply, she finally stepped out of the room.
Once out of sight of her presidential suite, Huo Sining looked around. After confirming no one was in the corridor, she quickly chanted the Invisibility Spell to conceal herself.
