I'd say Theresa May is in quite a strong position at the moment: a "soft Brexiter" by instinct, she plainly feels vindicated by the apparent success of the negotiations so far.
We should bear in mind that her position is governed entirely by the whim of her own party, and she is actually in a rather unique position of being shored up by the opposition: the fact that an election just now is unthinkable to most of her Brexit opponents (including the DUP) actually counts in her favour, that and the fact that she has no credible opposing figurehead in her own party.
Matthew Parris is the Times today has mischievously suggested that maybe her plan is actually to have no plan, but to let the "Brexit toddlers" (evoking the toddlers in Eliot's Middlemarch, who set out with unrealistic amibitions to conquer the world) retreat in the face of reality all in good time. If that WERE her idea to date (which I doubt) it has worked a treat so far :-)