This could get ugly for your friend. If there are separate incidents, that's worse (versus 5 people all in a group). If he is alleged to have used the gun in ANY way, it could add a mandatory 10 years. The exact charge(s) she is convicted of (if any) matter. Needless to say, she needs the best lawyer she can get.
The above answer is for general information only and is based on the information you posted. Every case is fact dependent, so to get a thorough analysis of your situation, you will need to consult face to face with an attorney licensed to practice in the jurisdiction where the incident took place. Do not conclusively rely on any information posted online when deciding what to do about your case.
It is very difficult to tell you what she is looking at for this case. We don't know if there are separate acts vs. one act, we don't know if she is being charged with gang enhancements which could give her higher exposure for the gun even if she didn't use the gun.
At the very best she is looking at 10 years prison - that is only if she aided and abetting (get a away) driver and not the person who actually used the gun and no gang allegations.
This person should not represent herself.
The above information does not establish an attorney client relationship nor is it meant to provide legal advice.
She is looking at serious trouble. The Conspiracy charge makes her eligible for all the other offenses including the strikes for serious of violent felonies. There are lifetime consequences for any conviction. As pointed out by others, she will need an attorney.
Having once been a prosecutor in Shasta County, I can say that the highest level attorneys at the Public Defender's office are very skilled and can serve her well if she can not afford an attorney. If she is seeking private counsel, Joe Gazzigli, Adam Ryan, Eric Berg and Robert Hammonds are all excellent trial attorneys.
This does it create an attorney-client relationship. That costs money and this is free.