She must have stepped on someone's toes.

https://www.breitbart.com/politics/2019/01/29/furious-democrats-plot-make-ocasio-cortez-one-term-congressperson/

‘Furious’ Democrats Plot to Make Ocasio-Cortez a ‘One-Term Congressperson’

Democrats have considered if they want to primary challenge Rep. Ocasio-Cortez, a progressive freshman Democrat and a rising figure in Democrat circles.

Reportedly, at least one House Democrat has urged the New York delegation to recruit a local politician from either the Bronx or Queens, New York, to challenge the progressive Democrat.