Sudden Language / Accent Acquisition (Xenoglossy; Foreign Accent Syndrome)

[Mythopoeika]

Who on earth decided that was a Welsh accent?
Edit: OK, I've listened to more now, and it does sound a bit Welsh, but in some places it's all over the place, at one point it almost sounds Polish.

It does sound like a lovely Welsh accent.
There is a part of the video where she sounds 'foreign', but that is the phase she went through before the Welsh accent took over.