Doesn't fucking matter. I can go online pretending to be a 15-y.o. and if some adult will start hitting on me with sexual suggestions, it's against the law. Doesn't matter if there was a minor involved since the key problem is an intent to break the law. It's like saying "yes, I wanted to hire a hitman, but since that person was really an undercover policeman, I couldn't really hire anyone, so I cannot be prosecuted for that".
I am pretty sure Jelly is 16, however, the real problem is that she is as stable as a burning fireworks warehouse and cannot be trusted with bringing Alex to justice. Just like her parents who allowed her to do all this terminally online stuff, so no justice this time either.