Besides this one, there are two Class-Based Summoning Campaigns this year, end of March and end of August. You also get a GUARANTEED 4* at the 10M downloads campaign this September. Unfortunately, there aren't any campaigns where she is the only 4* rate-up. If you're looking for the best chance via Gacha, it's this campaign, and two additional Heaven's feel campaigns (est. early October + January 2019).
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