Seems harsh , but she might understand the concept if ya try it . My daughter doesnt do the dog thing , but sure has to contol every conversation that I am having with anyone . She too is 9 and it can be somewhat anoying at times.
Have you tried actually treating her like a dog for a few days. Dog food in dog bowl, dog house (a card board box), dog collar, leash. No furniture priviledges.
And no talking of course. Maybe a dogs life isn't so hot after all.
If that doesn't work seek help. Please.