Wendy is an underdog. On paper, her stat line is defensive, since her high willpower can’t easily be turned into magic. (Not without stealing teammate’s cards, which is possible because mystics usually have duplicates.) But out of the box, she’s a 'Survivor most likely to Succeed.'
Rita can dodge and fight better. Stella can fail better. Yorick has amazing powers of recursion and can obviously slay better, and Silas gets more value out of skills. Patrice and Calvin have their own specialties...
But Wendy can look at the auto fail or a pull that would put doom on a nearby cultist and just say “nope". And after the Innsmouth conspiracy was revealed, this went from pretty great to amazing.
With Ancient Covenant, all you need to do is see a bless token and you’re succeeding. One copy of Keep Faith in your starting hand along with your amulet lets you add eight blesses to the bag, at the cost of four resources and one action… And Keep Faith returns to your deck.
Going off the orphan theme, Wendy can take On Your Own, and if she’s waiting to wait until the upkeep phase, can do the above combo for zero resources. Want allies? Borrow them with your rogue cards or chance encounter, paying two bucks less than they did to put them in to play!
Combined with favor of the sun, and Wendy can investigate a five-shroud location without needing lockpicks. With your picks, you’re going to trigger any rogue “succeed by” card you want, and if you need money to prime the pump, Faustian Bargain can be played twice! 10 bucks in three actions, shared with anyone in your space... then trap three of the curses with favor of the moon.
You could even build a gimmicky fighting Wendy, with Eye of the Djinn in one hand and a Fire Axe in the other. Underestimate that at your own peril! Succeed at your leisure.