07:35 PM EDT 10/16/2013
Originally posted 02/19/2013 12:55PM
On Sunday night, when news hit of Mindy McCready's apparent suicide, Lisa D'Amato got a phone call from actress Mackenzie Phillips, a cast mate on season 3 of Celebrity Rehab with Dr. Drew.
"We were just trying to put it all together, figure out what happened," D'Amato tells PEOPLE. "Mackenzie doesn't know either. The one thing about Mindy is that she was very much seeming to be fine and perfect on the surface, but she was battling a lot."
McCready, 37, became the third person from their season to die, joining musician Mike Starr and reality star Joey Kovar. "I'm just numb," says D'Amato. "She was such a beautiful, warm-hearted, giving, lovely woman."
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