Dehydration
Frances was 78 years old and did very light workouts every day.
She didn't sweat so she didn't think she had to drink a lot of water.
On July 4th, 2016 it was 100 degrees out and she went for a walk.
During halfway through her walk she got dizzy and fainted.
She woke up in the ER and the Doctors told her she was dehydrated.