I think she will hate NYC when she actually lives there. It does not care about people like her for more than 5 mins. There is always someone prettier and more interesting. When she's on a summer holiday, well that's different. Different vibes.
Plus, the dating scene is horrid in NY. I knew models who couldn't get a date. My best friend, who is super gorgeous, did not have a boyfriend there of more than a month duration, until she met her husband, but for like 10 years nothing - and there is ZERO wrong with her. Just the way it is, men there, for the most part treat women like they are at a bus stop and the next one, equally gorgeous, but a different flavor will be along in 5 mins, ghost and repeat. So many women will say the same - in fact beyond the "lack of time and space" conversation it's got to be one of the most prevalent convos you'll overhear in a bar. It's insane. It's worse than any city I've ever lived in (London, NY, Melbourne, San Francisco, Austin), in that regard.
Not that she's there to find a man. Maybe she thinks she's already found one. And maybe she'll just hang with fellow Brits in one or two neighborhoods. I hate that kind of thing and the Brits and Australians tend to do that a LOT. But making real relationships and connections takes time and the city makes most folks who are not of the uber rich variety (and she is wealthy but not uber wealthy) grey complected and hyper vigilant about everything. It's not an easy city to be healthy and balanced. Of course she can have some superficial fun for a bit, but to stick it out will take moxie.
I do love it there - lived there for 15 + years, but it's love/hate all the way and I'm can say definitively I'm way tougher than Lizbutt - no joke. I'd say now I love it from afar like an old flame who I know isn't good for me but who I can admire for their good qualities all the same.