If its based on interviews then its only your speculation.
Camila was actually the one with bubbly and easy-going personality.
Lauren, in other hand was the one that are being closed and keeping it private.
If you follow them since their takeover video you will know why Camila has many followers and being a fan favourite. girls is very talkative and nice with everyone.
I love them so much in their youtube takeover videos, so innocent and fun to wtach.
Camila was probably wrong to take the duet opportunity with shawn, but the other girls also pouring their saltiness to make situation getting worse.
Look at Kpop, one member can have duet, solo, and still being active within the gorup, slaying both left and right.
Jealousy and insecurities were actually what makes the situation becoming out of control end very toxic to watch.