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HIGHLANDS RANCH, Colo. - Thursday morning we should find out whether the second teen accused of plotting a deadly attack at Mountain Vista High School will be charged as an adult.

Two 16-year-old girls are accused of conspiracy to commit first-degree murder.

One of the girls, Sienna Johnson, was formally charged as an adult last week. Johnson is being represented by a public defender. Her bond was set at $1 million.

MORE | Criminologist: Mountain Vista teen had many red flags

The second girl has a hearing scheduled Thursday morning. Denver7 will only identify her if she is charged as an adult.

Last week, a psychiatric evaluation was ordered for her.

Her lawyers claim that investigators have centered their case around her therapy journal and her cell phone, which they say were seized without proper consent.

"There is no direct evidence in this case of Defendant’s possession of any weapons, bombs, or incendiary devices," attorneys stated. "Instead, the prosecution’s theory hinges upon entries written in Defendant’s personal journal, which was seized by law enforcement without a warrant and without consent of either Defendant or her parents."

The personal journal was written at the urging of the girl's professional counselor as part of ongoing therapy, attorneys said.

Her attorney issued a statement on Tuesday distancing his client from Johnson. He called them acquaintances, not close friends, and said they only knew each other for a short time.

"They have different backgrounds, personalities, motivations and behaviors," attorney Russ Rizzo stated.

Attorneys for the girl said the prosecution's case is not strong.

MORE | Texted tip stopped Mountain Vista High School threat

Someone notified Mountain Vista High School about the threat over the Text-A-Tip line on Saturday, Dec. 12. The specific nature of the threats hasn't been released. Many details of the case have not been made public, because court documents are sealed.

In court last week, prosecutors said Johnson had a detailed map of where everyone in the school would be and knew the school resource officer schedule. They added that Johnson already bought a BB gun to use for target practice. The prosecution called her extremely violent and said she harmed pets in the past.

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