She is British (it says so on her site). Using plural verbs with organizations ("the police are coming", etc.) is perfectly correct British English; same for "at university" [1].
I'm not a native speaker, and learned British English in school, American English through informal practice while living there, so I may not have picked the greatest example. :)
I think it is. I don't know the rules, but I've never heard a US English speaker use an entity like "Disney" as plural. That said, "the police" is always plural, and I have no idea why that's different.
It's not correct American English, but she's not American.
The only thing I'm not sure is correct in non-American usage is the capitalized "University"; I thought they used lowercase for the generic (much in the same way we use "college" in the US). The rest, though, reflects common usage outside the US.
[1] http://www.amazon.co.uk/Writing-at-University-Phyllis-Creme/...