Shelby says she has anxiety and depression and a past history of dependency on drugs. She admits her drug use “took off” at age 15 after the death of her sister, Kelsey, from an overdose in 2011 and that she has overdosed on four different occasions and has been in-and-out of rehab multiple times. However, she says she is currently sober and has been for 6 months.

TELL DR. PHIL YOUR STORY: Life in crisis?

“Your brain gets involved with anxiety and depression, and that has to be dealt with,” says Dr. Phil, adding, “I want to give you the help you need to find out what you need to do to eliminate this from your life.”

WATCH: ‘I Just Want Somebody To Blame,’ Says Woman Of Sister’s Overdose And Death

When Dr. Phil refers Shelby to the PNP Center for a complete neurological and biochemical evaluation, Shelby refuses in a single word: “No.”

Watch the conclusion of this two-part Dr. Phil airing Tuesday. to find out why Shelby says she rejected the offer and whether she changes her mind.

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TELL DR. PHIL YOUR STORY: Chaos in your life?