You’re leaving out the main issue - IT PROBABLY NEVER HAPPENED!
I’m not responding to the “did she do it” part. I am responding to some people stating that an adult woman having sex with a 15 year old boy is normal and something to be celebrated. It is that point that I completely disagree. I will say this though: if this woman didn’t have a sexual relationship with this kid, she shouldn’t have gone on a “bonding” camping trip with a student. I also wonder what type of DNA was recovered from the sleeping bag. Hair from the head is reasonable... uh, other DNA from her female parts wouldn’t be so readily explained.