Because the bonnet she wears appears to be based on the
Scottish design, the internet has determined that she is Scottish.
As for what she's saying:
"What ya starin' at ya wee posh cunt?" -> "Excuse me, Miss, but it is awfully rude to stare."
"We gonna have a fookin' pokémon fight or wot?" -> "Let us bond with each other over a magnificent pokémon battle."