In the given audio https://voca.ro/135zSkjYsgDP the girl is saying もう直ちゃん言い方 to 直ちゃん. It is about the 05:49 mark from 聲の形 if you watch it from the Bluray.
If I understand correctly the ちゃん shouldnt affect anything in this case: Pitch Accent for Honorifics.
I can't for the life of me hear whether this is atamadaka or heiban. I can convince myself it is both, so I'm wondering what people with trained ears hear this as. I know the audio is short, sorry about that.