Well her getting a crystal means she's getting a Z-Ring. Question is... how does she get it? From her mother? Furthermore, when is she, much less a Female protagonist, going to catch a 2nd Pokemon? I mean Serena caught Eevee in Episode 89. So far the entire cast(minus Ash) has three Captures(Charjabug, Marowak and Alolan Vulpix), one Evolution and two Z-Crystals. Take the guys out and Serena embarasses her companion "sisters" by a long shot. Hell Iris matches and will surpass them soon enough since she catches Dragonite in Episode 89.
Hard not to say that from a Female perspective, Sun and Moon is worst series to date.