BOISE -- Family and friends honored the life of 18-year-old Sierra Bush Wednesday night.

Sierra - also known to many as "Simon" - went missing in late September, and police say a passerby found her body on Saturday in Boise County near Idaho City.

MORE: Body of missing Boise teen found near Idaho City

Sierra/Simon's loved ones gathered at the Boise State Student Union Building from around 6 pm. to 7 p.m. to remember the life she lived and share stories and heartbreak. They say Sierra/Simon was talented, kind, brilliant and witty.

It was apparent how many lives she touched throughout her 18 years and throughout her short time on Boise State University's campus.

There were so many people inside the Jordan Ballroom for this event that organizers were adding more chairs up until the minute it began.

The ballroom was full of Sierra/Simon's friends and family, as well as students and faculty from the Boise State community.

"One of my favorite quotes from her is: 'If I can be as weird as I am, you can be as you as you are'," Sierra/Simon's friend Samantha McGraw.

"She teaches us how to push things to the limit even if others tell us no," one of Sierra/Simon's friends told the room Wednesday night.

Many of her friends - and those whose lives she impacted - got up on stage and shared stories and life lessons she taught them.

"She touched my life without me even knowing it," a fellow Honors College student said to the group. "I am so incredibly blessed to have met your daughter and your friend."

Evan O'Beirne, one of Sierra's close friends since freshman year of high school, told KTVB she was one of the most amazing people he had ever met.

"She helped me become who I am today," O'Beirne said. "The impact that she had on people - even if you met her for only one second - it was the acceptance that you felt. You didn't have to pretend anymore, it was like, OK this is safe."

A first-year Boise State engineering student in the Honors College, Sierra/Simon was involved in a wide array of activities and clubs on campus.

"Here's a student who one minute was a braniac in engineering, and the next minute wanted to be a creative writer," Boise State President Bob Kustra told KTVB.

Kustra says he stands alongside students in grieving Sierra's death.

"It's a great loss for this campus community and for these students who loved her," Kustra added.

This gathering was put on by different organizations on campus to provide a place for people to open up and grieve. They are helping connect students with supportive resources, and University Counseling told students and staff that they are available for anyone at anytime.

Still shocked and confused as to how she disappeared and how she died, those whose lives she touched say they will carry on her legacy.

"Really just spreading her message of loving yourself, being who you want to be, not letting anybody stand in the way of your dreams," McGraw said.

Police are investigating how Sierra/Simon went missing and died, and they are calling the case "suspicious." Friends, family and authorities say she's not the kind of person that would ever run away or disappear without telling anyone.

There is a memorial GoFundMe set up to help her family with funeral costs and other arrangements.