One thing I wanted to do with this part of the comic strip was to show Jenny's family reacting to this magical world they're in, and the best way I thought I could do that was to show them interacting with specific characters. And the best person for Jessi to interact with seemed an obvious choice to me -- Cecelia! They're both older-sisters-in-law now, after all. (Evil grin.) By the way, we've seen Jessi use her cellphone at least once before, in Strip #393, so she's had it for awhile.
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