A regional accent emerging: friends trump family

Overheard from my eldest daughter at the end of a skype with cousins...

Grace: /Wəts 'ðæt pɪkʃʌɹ/ (What's that picture. )
Katharine: /ðæts ə pɪkʃʌɹ əv ænt 'ɛli/ (That's a picture of aunt Ellie. )
Grace: (annoyed) /'ɒnt ɛli/ (*Aunt* Ellie. ) 

 So Grace is beginning to assert accent independence from her loving parents. I'm pretty sure neither Katharine nor I routinely say ɒnt, so this must be coming from school (it is, I believe, the standard pronunciation here in New England).