The 71-year-old, from Llangollen, said: "I am furious at what she has done to our party".
"Locally, with the masterplan that has come from the Conservative stranglehold, I think people want more voices on the council so we have more opinions and more ideas".
The Conservatives - who won 33 of 43 seats in the last election in 2015 - took 26 from 47 today, with the Ashford Independents taking their tally from three councillors to 11.
The Tory leader of the council Cllr Andrew Williams was re-elected, after moving to the safe seat of Adeyfield East.
Green Party co-leader Jonathan Bartley said: "This is the biggest election night in our history".
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Updated 3 May 2019: This article was updated to clarify that the addition of 1 seat to the Labour Party's majority was the result of a by-election for King's Hedges ward, in which one seat had been made vacant by the tragic death of Nigel Gawthrope in January.
Both the Conservative and Labour high commands left no doubt that they saw the results as a demand for resolution of the Brexit impasse three years after the 2016 vote for European Union withdrawal.
All 54 seats are up for election.
The Conservatives had previously held about 60 percent of the more than 8,000 seats being contested across England and Northern Ireland.
The councillors are Liberal Democrat party leader David Tutt and newcomers Helen Burton and Rebecca Whippy.
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The Liberal Democrats, led by Vince Cable, gained ground at the expense of Labour and the Conservatives in this week's local races.
In her acceptance speech, Conservative councillor Helen Greensmith took aim at the national party.
Lorna Dupre, leader of the Liberal Democrats was jubilant with her members, as she said the results reflected that they were here to stay.
Labour became the first party in 20 years to win a second term in charge of Brighton and Hove City Council after narrowly beating the Greens.
May told her party in Wales: "There was a simple message from yesterday's elections, to both us and the Labour Party: Just get on and deliver Brexit".
The problems for the two main parties could worsen at the European elections when they will also face the Brexit Party, who are riding high in the opinion polls, and the anti-Brexit group Change UK, largely formed of centrist Labour defectors.
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In Wisbech it will be a return to mainstream politics for Dave Patrick, now an independent but one time Lib Dem who flirted, oddly, with UKIP but who saw off the Tory sitting councillor and former mayor Gary Tibbs.