[Oh... this isn't the one she talked about Junko with. Maybe she doesn't even know who Junko and Adachi are. After some of the different versions of people she's met already, she doesn't want to assume anything. If she does that, she might scare her away, and she really needs someone right now.]
You're... Super Sonico-san, right? The model? I've seen pictures...
[It's true, she saw pictures of her in Naomi's dream and assumed that she was a model right away. She's not outright lying and saying she's never met her in person, but she leaves that open for the older girl to assume. And since she's nervous and that ended on an awkward note, she smiles and adds:]
You're even prettier in person!
[That's not even a lie or part of the act, it's how she actually feels. She can't remember if she told the other Sonico the same thing, but she was definitely thinking it.]
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You're... Super Sonico-san, right? The model? I've seen pictures...
[It's true, she saw pictures of her in Naomi's dream and assumed that she was a model right away. She's not outright lying and saying she's never met her in person, but she leaves that open for the older girl to assume. And since she's nervous and that ended on an awkward note, she smiles and adds:]
You're even prettier in person!
[That's not even a lie or part of the act, it's how she actually feels. She can't remember if she told the other Sonico the same thing, but she was definitely thinking it.]