At $15.50 an hour, she earns $387.50 a week, or $331.95 after tax. She also gets $107.45 a week in accommodation supplement and disability allowance.
But when her income rose, those extras were cut, leaving her - by her own estimate - $40 a week worse off than she would be on a benefit.
Work and Income's head office in Wellington checked Ms Berry's case for the Herald and confirmed that she was worse off in work, although by only $23 a week, because she was previously on a six-month trial under which invalid beneficiaries can go back to work and keep getting their full benefit as well.
"The intent of this policy is to allow this group of clients to test whether they could move into the labour market, for 15 hours a week or more for up to 26 weeks, without losing their entitlement to invalid's benefit," the agency says.
When the employment trial finished at the end of the six-month period, Ms Berry decided she was able to continue working between 22 and 25 hours a week and therefore would no longer qualify for invalid's benefit, the agency says.
"Ms Berry said she loved the work and working with children and opted to stay in work. Numerous studies show that paid work has health benefits and is a valuable tool in aiding the recovery of many health conditions."