To be fair people usually have 2 grandmas, so it is possible that she was talking about the other one... Then…
As a French person I can tell you, that in French you don't make that difference. Grandmother is Grandmother. If you want to specify from which side you have to add my mother's side or my dad's side.
I had the exact same reaction yesterday. But I forgave quickly because thanks to him we saw cutie pie jealous Rak 😍 and his relationship with Connor is cute too.
He is great!