There is nothing cynical in Mrs May's action - rather it is politically astute.
You have the Lib Dems and the SNP wanting to defy the majority of the people who voted to leave the EU and scupper the process, and you have a Labour party who, as a result if its leader, being completely unelectable.
What the GE will do is increase the Tory majority quite significantly, slap down the undemocratic SNP and Lib Dems, give Labour a pasting and legitimise her position (not that it needed it - even though some people whine about not 'voting' for her to be PM).
Labour should be thanking her - when Labour have taken a pasting I would be surprised if Corbyn didn't fall on his sword, thus paving the way for a new Labour leader that may be able to turn them back into an electable party.