Seems to me she's not just the prisoner of her MPs' whims at this point but to the whims of major market players as well – a different beast to being ideologically captured by a particular faction. She was already signalling (bankers' bonus cap) that she recognises the City has all the power in its relationship with the government atm, and now she's entirely vulnerable to the ups and downs of buying and selling, in all its chaotic, contradictory, rumour-fuelled, cocaine-addled, "would you like to ask the audience" glory.
What's going to be interesting about this era, in terms of historic analysis, is looking at how the real "powers that be" move to discipline an errant servant who has, technically, gotten hold of the reins. Crushing though all this is to her as a Prime Minister, it's the gently gently version of what Corbyn would have been facing, had he not fallen at an earlier hurdle. I said it when he was first elected Labour leader, but I find it baffling that people thought Corbs would be able to achieve his objectives without the presence of a fully rebuilt extra-parliamentary power base to counterbalance what we're seeing now.