H.,
I have a few questions in order to properly give you my thoughts.
Other than just talking to your daughter about her behavior, what other things have you done? For example, taking away free time or not allowing her phone time for every hour she spent talking during class?
Does your daughter realize that she is being rude and disrespectful by talking nonstop while the teacher is speaking or does she think that it is okay to interrupt only because she HAS to get out the juicy news to her friends? Sometimes, kids don't think about what they are really doing. They just act without thinking, you know?
If you wouldn't mind answering those, I would love to help.