This was to be expected. Wasn't just her. Most of her colleagues wanted the same thing.
This is the problem, only a few MPs in the Conservative party and UKIP genuinely wanted to leave and I expect that these remain loyalists are going to have to be dragged kicking and screaming because otherwise they'll postpone it as long as they can, it will be like watching American politicians deal with the debt ceiling, constantly saying it's the end of it and then raising the bar every couple of years. The same thing will happen with Brexit this time and they won't leave unless they're forced to get the country out.
That whole country survived on banking, being Europe's financial center. All their other industries sucked on the bankster titties. Without banking UK is finished. Their whole economy is built around banking and without that their whole economy's worth shit. Many people know this which is why they don't want to actually leave. UK doesn't produce much. It imports most of the stuff they consume. Whole of UK is riding on London's wealth.
We could survive and do a lot better without the banking system, just take a good look at this example from history.