Answer: Old age
Very few Disney characters get the luxury of being able to die of old age, though Gothel's death was hardly peaceful or dignified. Rapunzel promised to submit to Gothel if she could heal the dying Flynn Rider of his wounds, and Gothel agreed knowing that Rapunzel would never break a promise. Before she could start the healing incantation, Flynn cut Rapunzel's hair with a shard of glass as he wanted to set her free. Gothel started ageing rapidly and was struck with a hysteric panic. The mascot character Pascal pulled Rapunzel's hair taut and Gothel tripped over it, falling out of the tower. By the time she hit the floor, all that was left was dust.