The teenager is facing 12 charges in total including aggravated murder and attempted aggravated murder.
Thursday members of the Wride, Sherwood and Grunwald families were in court as a judge decided to move the case forward.
"Court has found that the state has met it's burden regarding to the charges that will be made," said Judge Darold McDade.
On Thursday's preliminary hearing prosecutors focused on several phone calls made from Grunwald's phone to family members.
One was a 45-minute conversation that was recorded with Grunwald's father the same day the sergeant was shot.
Prosecutors plan to use the call as evidence during the trial.
According to other testimony, Grunwald's bloodwork showed she had been using drugs.
"Miss Grunwald tested positive for methamphetamine's," said Utah County Investigation Bureau Sergeant Scott Finch.
It is unclear if Grunwald was high during the January shoot out. Upon a search of Grunwald's home, law enforcement found reloaded bullets, a scale, glass pipe, cigarette lighter, x-acto knife, plastic baggies, some envelopes and papers along with methamphetamine's.
This is important because of the relationship between the duo.
"From my understanding is that Garcia had access to that room also," said Sgt. Finch.
Prosecutors say the gun used in the shoot out was modified to fit 9 mm and 40 caliber bullets, the same ones found in the Draper home.
"We have no evidence to suggest that she pulled the trigger," says Sam Pead, a Deputy Utah County Attorney.
The defense will have a different story to tell, Grunwalds story.
"She was forced to do it. There will be testimony offered if this matter goes to trial that, that gun was turned on her in more than one occasion," said defense attorney Dean Zabriskie. "That her choices were reduced to comply or give up her own life and then things just spun out of control."
Prosecutors were quick to refute the argument saying the charges meet the crime. "Mitigating factors are not necessarily an element of any of the crimes so to the simple answer of your question is yes the charges meet the crime," said Pead.
It was a welcoming sight to the Wride and Sherwood families sitting in the court room.
"Personally I feel relief that the state thought there was enough evidence and the judge saw that. So, I guess a little bit of relief right now," said Johnny Revil, a Wride family spokesmen.
Once the trial begins, Meagan Grunwald will finally have her chance to tell her side of the story.
"There was no exchange between she and the police who arrested her. No one has talked to her. No one knows her story. Haven't even heard her voice. I'm sure you all will be somewhat impressed when you hear it," said Zabriskie.