She told Hawke's Bay Today on Sunday she would not be commenting further.
The former staffer, who reportedly worked in Parliament for more than a decade, said she was Lorck's third executive assistant in about a year and a half.
"Her behaviour is erratic, it is really hard to work for her, she is being rude, demanding, she will ask you one thing and send you 15 emails in a day asking you to do all this stuff - she was [all] over the place," the ex-staffer told Stuff.
She claimed she had raised her concern about Lorck with Parliamentary Services in February, but was only offered counselling.
Lorck has been the Tukituki MP since the 2020 election, where she defeated National's Lawrence Yule by 1590 votes.
The claims come in a week where it was revealed new National MP Sam Uffindell had been involved in historical bullying and harassment claims.
Uffindell was asked to leave his exclusive boarding school after viciously beating a younger student late at night.
Labour MP Dr Gaurav Sharma also called out alleged bullying within his own party this week, and was then accused of it himself by a former staffer.