Her ancient phone's screen finally cracks. Screen inaccessible. She puts the old phone into a bowl of water so it will turn off and she can re-sync all her blueteeth to her new phone. Several days later, the remnants of screen still show signs of lighting up. She removes it from the water. A few hours after that, a low battery warning beeps on the cracked phone. This thing is invincible.
It only became invincible after the screen became unusably cracked.