Prue was used to the different family dynamics here. During her year and a half in this place, she'd encountered a few versions of Piper, two versions of Phoebe and one version of Paige. Oh that had been incredibly weird with Paige, especially after first while Prue was still trying to adjust to the whole being dead at home thing. But with the constant coming and going of their family, Prue just tended to roll with things. And the fact that the Phoebe here now was much closer to her in age didn't really bother her. In fact, it probably worked in their favor and could, in theory, keep them from fighting so much.
Despite the various versions of her sisters showing up here, there were still some things she didn't know about their future. She knew all about Cole and what had happened there. She knew about the utopia thing. But while she did know that, she didn't want to just come out and say as much, especially about Cole. The other Phoebe had told Prue she'd been right about Cole, but what about this one? That had been a topic that fueled their rivalry, and Prue didn't want to ignite that again.
Upon the invitation to enter, Prue stepped inside, closing the door behind her, then stepped inside. "Hey, I hope rocky roads ice cream is all right." Prue smiled a bit, setting her scrapbook and ice cream down on the table. She looked up at Phoebe for a few moments, then went over to her, opening her arms to her for a hug. Prue didn't need to be an empath to know that Phoebe needed a hug. And Prue could use one herself.