At that time, when the recording was done, all of them were so engrossed in the moment that they couldn't get their mind to use time upon complimenting her song. After hearing it clearly again, she already got to know that her younger daughter had an amazing talent hidden beneath her securely which she wanted the whole world to know.
She again jumps into her own conclusion, wondering maybe singing might be Annabelle's real passion as she was always so aimless about her own life and borrowing her sister's dreamlike before.
But who could ever guess that it was not something her daughter desired to begin with?
Well, Anna wouldn't be so triggered if her mother just published any other tapes and random recordings of her. But what she published was the most wrong one to be exact that she didn't realize.
That was the point where her mother could never understand her actually.