Brexit has been sabotaged by a conspiracy by May? You seriously believe she is devious enough? This is tin-foil hat nonsense.
Brexit is and will be a failure by definition - simply because it was never specified exactly what it involved. There are 1000s of ways to NOT be a member of the EU. "Brexit" covers all of them so leave-supporting politicians have been arguing furiously on the basis that their particular version of "not being in the EU anymore" reflects the "will of the people".
The "Leave" movement consisted of many incompatible positions on the future relationship - this was made clear in the run up to the referendum. Many Brexit supporters advocated a Norway (EEA) type relationship, others wanted to stay in the Customs Union, others wanted a Canada free trade type of relationship, for other the European Court of Justice was the red line, for a significant number immigrants were the problem, etc.
Surprise, surprise, no matter what May presented was going to be objectionable to a majority particularly if you include the remain supporters. There is no conspiracy required to see that this circle is impossible to square.