My classmate stole my chance

So we had an presentation and we made a group of 10 people, 5 people in the group had to explain the slides in the presentation and other 5 were there for QnA session,

I have been preparing for this presentation for weeks and wanted to go out and give answers to people, i was part of the Q&A session.

I have been shy and introverted for large part of my life as i struggled with self image, recently i have been trying to make it better and go out of my comfort zone.

I saw this presentation as not just an presentation but an opportunity to speak up, so i prepared a lot for it.

But today when the day finally came and we were up for Q.A a member of my group who was a part of the explanation of slides, went there and didn't leave the podium answered all the questions on her own and didn't even ask if anybody else wanted to even though it wasn't even her place to be there. She just kept going and for some questions she was like I'll answer this i have to show this certain classmate how well I'm versed.

Just so you guys know it wasn't supposed to be like this people explaining the presentation can answer questions but only when the people assigned for Q&A can't answer it.

She stole the spotlight the teachers loved her, and once again i couldn't do anything.

The presentation is over I'll never join her team again, i don't wanna create a scene as college just started i don't wanna make enemies out of people, it's really easy for others to just tag as she is part of a big friend circle.