The woman tried intruding the minds of the hotel occupants, going through them one after another. Normal humans have no way of putting barriers in their minds. They're vulnerable to people who have the ability to read minds just like her. She started with the employees to the customers in the hotel restaurant.
Unlike Serina, this woman has honed her mind reading ability without being afraid that someone would find her through mind link. She can display her power fearlessly.
She was looking for a person with a mind barrier. It was taking her time but she didn't mind. If she can find someone who has the same ability as her, there's a chance that she'd be able to find her parents as well.