No, she doesn't, but she is 18 and she comes from York. I read that some people still do that in some parts of Northern England, but I guess it does not apply to York and the 'thou' thing might be true of older people only, and supposedly also to those who live in more rural areas?
Apparently the dialect spoken in West Yorkshire is broader than here in York (North Yorks.). Even young people say
t' for
the, for example. But people all over Yorkshire sometimes say 'me' for 'my'!
In
The Adventure of English, Melvyn Bragg says he used to 'thou' and 'thy' his friends in Cumbria back in the 1940s.

Anyway, thank you for your answer!