Afterhitting rock bottom in 2010,Demi Lovatofought her way back up to the top with chart-topping albums and several sold-out tours beforeher shocking overdoselast week.

The singer, 25, hasproudly — and publicly — celebratedher sobriety milestones over the last six years, but a longtime friend tells PEOPLE exclusively Lovato struggled privately with the pressure to remain clean.

“Deminever wanted to be a role model. Her sobriety over the last six years was a fight every single day,” says the friend. “After she finally got clean, her team was very hard on her and treated her like she was a kid. It’s so hard to have all these eyes on you all the time.”

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24th MTV Europe Music Awards, Arrivals, SSE Arena Wembley, London, UK - 12 Nov 2017

Over the last year, Lovato yearned for more freedom and “slowly started breaking away” from her tightly regulated life.

“She is so young and she also has a very rebellious personality,” says the source. “She wasn’t drinking or using at first, but she’s even said herself that she can’t be in a [party] environment. She thought she could handle it, but it’s a very slippery slope.”

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For all the details onDemi Lovato’s hospitalization and ongoing struggles following her overdose, pick up the latest issue of PEOPLE, on newsstands Friday.

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California Mid-State Fair Featuring Demi Lovato and Iggy Azalea

In March, the “Confident” singer marked “6 years sober” on her social media accounts, writing that she was “so grateful for another year of joy, health and happiness.”

Wilmer Valderrama and Demi Lovato.Kevin Mazur/VF16/WireImage

2016 Vanity Fair Oscar Party Hosted By Graydon Carter - Inside

Sources told PEOPLE on Monday she is expected to make a “full recovery,” but that decisions in terms of treatment had not yet been made.

“It’s too soon to say what thenext steps are in termsof entering treatment,” a source close to Lovato told PEOPLE. “Right now everyone is focused on getting Demi physically healthy.”

If you or someone you know is in need of help, please contact theSAMHSA substance abuse helplineat 1-800-662-HELP.

source: people.com