She has always starved, starved for love, starved for acceptance, starved for a real family. A family that will believe in her. The one that cares for more than her ability, for her as a person.
When she finally gets them, she isn't starving anymore. She's full, but she's on her way to die. Somewhere in her, she realizes that she would rather die then starve more. Then be a walking corpse.
Of course, being neither is definitely preferred. So she fights, fights against the people who starved her.
And she wins. Hazel Levesque is full and so, so alive.