Don't see that in that article, especially the bit about being passed over for a spot (then again, I did speed read it), I do see this though:
"Cruz campaign spokeswoman Catherine Frazier said the senator "considers Katrina a friend [and] will always be grateful for her dedication and hard work to get him elected.""
And:
“I’m absolutely surprised she went to work for Trump because he’s not a conservative,†wrote Texas state Sen. Konni Burton in an email, stressing that she hoped everyone would work together in support of the eventual nominee. Along with Pierson, Burton was an early and active supporter of Cruz’s 2012 Senate bid, and she was one of the few candidates running in 2014 to secure Cruz’s endorsement in a Republican primary." Read more: http://www.politico.com/story/2015/11/donald-trump-katrina-pierson-216005#ixzz3yalohxmN
Looks like "some allies" of Team Cruz accused her of being lazy and wanting attention (this is exactly what Ted Cruz was accused of doing when working for the George Bush campaign: being lazy and wanting to get attention), but nobody bashing her for being a far lefty.
By the way, Pierson was endorsed by Sarah Palin for her own run.
I guess it took working for the Donald Trump campaign for all these "conservatives" to discover Pierson was a Communist.
Her own words were she can be more herself. I’m sure the Cruz people realized she was a phony. Apparently she fits right in with the Trumpbots.