"The people she has been hanging around lately aren't her real friends – they don't have her best interests at heart," an insider tells PEOPLE

Demi Lovato and Pals 'Were on a Binger' Night Before Overdose and Had Narcan on Hand: Source

Prior to her apparent drug overdose on Tuesday, Demi Lovato‘s friends had a strong suspicion an incident like this would occur.

“She and her ‘friends’ were on a binger the entire night,” an insider tells PEOPLE of the house party that continued after the group left Saddle Ranch. “They keep Narcan on hand for such situations – they were prepared for this. The people she has been hanging around lately aren’t her real friends – they don’t have her best interests at heart. She’s pushed her true friends away.”

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The source adds, “She had to find creative and sneaky ways to get drugs because her team and those that really care about her really try to keep a close watch on her.”

The “Sorry Not Sorry” singer was rushed to the hospital Tuesday morning following the incident at her Hollywood Hills home, hours later appearing “alert and stable,” a close source confirmed to PEOPLE.

According to the emergency call audio obtained by TMZ, Lovato had been unconscious prior to the arrival of EMTs and revived by her friends with Narcan, an emergency medicine used to reverse the effects of a narcotic overdose. Though reports have indicated the overdose was heroin-related, a source close to Lovato claimed to PEOPLE that it was not.

Image zoom Demi Lovato Christopher Polk/Getty

And while the insider says Lovato is “capable” of pulling through this, sources close to the star told PEOPLE they had been fearing an incident like this for an extended period of time.

“Things have been a total mess for months. She and her team severed ties, and they played a large part in getting her sober years ago. She hasn’t been in a good place,” a close source claimed.

Image zoom Demi Lovato

Last month Lovato released her new hit song, “Sober,” revealing her recent relapse following six years of sobriety. She performed “Sober” in Paso Robles, California, just two days prior to the apparent overdose.

Since her apparent overdose, Lovato has received a massive amount of support and well-wishes from fans and close friends, including ex Wilmer Valderrama.

Image zoom Wilmer Valderrama and Demi Lovato Kevin Mazur/VF16/WireImage

“He knew she was going through a tough time but he wasn’t prepared for this,” the source told PEOPLE. “He saw her through so many ups and downs and was her rock through some of her darkest moments. To see her back in such a sad and vulnerable place is heartbreaking for him.”

The source added Valderrama has “always cared deeply for her and they truly remained friends after they broke up.”

RELATED VIDEO: Demi Lovato Is ‘Awake and With Her Family’ In Hospital Following Apparent Overdose: Source

And though Lovato has been vocal about her struggles throughout the years, another insider revealed that Lovato’s period of sobriety was full of ups and downs.

“Demi was never really clean and sober from all of her demons. She has been fighting depression and anxiety for quite some time — and is still in such a dark place. She was sober for a while, but not completely sober for six years.”