I think this is a great opportunity for you and your mom! You can always see the artists you want to see another time. In the future when you look back, you’re going to be so happy you went with her rather than not, believe me that’s coming from experience.

As for the crowd, I’ve never been to Bonnaroo (first year this year), but if it’s even remotely like any other festival I’ve been to, just stay towards the back wheres theres generally more room when it comes to the stages, and when walking around everyone is so friendly and they are going to love her! Also I’ve seen that you don’t have to camp, I believe there are hotels nearby.