Weeks before her death, 23-year-old Olympic cyclist Kelly Catlin told her sister that she was struggling.
“On the phone she went back and forth from saying she was learning to appreciate things and enjoy life to saying if things didn’t change in a month, she was probably still going to kill herself,” Christine Catlin, 23, tells PEOPLE of her sister. “This was only two weeks ago. I thought we had more time. My last words to her were, ‘Please don’t kill yourself.’