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This idea depends on the genre, but what if she has a hidden superpower? Maybe every time she uses her power, she loses a bit of health or strength. That could explain why she’s so sickly. Also, she could sacrifice herself by using her last bit of power to help someone, which means draining her last ounce of health. I know it sounds cruel, but maybe it would be good to add the tragedy aspect.

Another way you could make her useful is if she has useful knowledge about something (i.e., a prophesy, the way the world used to be, a secret code/language, etc.)