Having grown up dad-less and dirt-poor, having faced the sudden death of her mother, having adjusted (mostly) to trailer life with a new loving but flawed French legal Guardian, having befriended outcasts, and having committed herself wholeheartedly to the field of entomology (she takes Darwin for her role model!), I would argue Lucky never lacked any power but the power to see that power, and belief in the love of her friends and new-found family. Lucky fearlessly fends of killer snakes for Pete's sake!
It takes a harrowing head-long odyssey into a dust storm, during which Lucky straight-up saves a five-year-old, reviving him with cold beans, ketchup and fig Newtons, and a final informal and impromptu send off for her mother for Lucky to find some faith in the strength of her own spirit!
The Higher Power of Lucky is the perfect book for anybody building a new life in the wake of change big or small, or running away to figure out what to come back to.
See also From the Mixed-Up Files of Ms. Basil E. Frankweiler, my favorite book and another unforgettable runaway story!