"We compete with the operational cost of a school so if there's not enough money to pay teacher aides, then our job is the first one to go," she said.
"Sometimes our contracts run term to term and some schools offer their teacher aides month to month contracts which means we're on edge not having that job security."
Birch is a teacher aide at Whangarei Primary School as well as a careworker for the aged.
Birch said up to 150 people, including teachers and school principals, attended Saturday's rally to make the community aware of how school support staff were being treated in terms of pay.
"It's time for the government to recognise there are groups of women who need to be acknowledged for the work they do for our kids in school. This time, we want to see a decent settlement."
NZEI will start negotiating pay equity claim with the government by the end of this year.