The former chief of the NHS trust at the centre of a superbug scandal in which 90 patients died is to take legal action to increase her severance pay.
Rose Gibb resigned ahead of the Healthcare Commission's report
Rose Gibb resigned from Maidstone and Tunbridge Wells NHS Trust just before news of the C.diff deaths at the trust's three hospitals was revealed.
The trust decided, after taking legal advice, to pay her six months' salary of £75,000 in a severance deal.
Now her union has said she will reject the payoff and demand more.
In November, health secretary Alan Johnson halted Ms Gibb's severance pay.
But the trust said last week she would get her legal entitlement.
The union, Managers In Partnership (MiP) said its own lawyers had advised that Ms Gibb was entitled to the full sum originally agreed by the trust, which has never been disclosed.
"We are disappointed that neither the trust contacted MiP or our lawyers before stories appeared in the media that the trust intends to pay only part of the sum originally determined," said spokesman Jon Restell.
"As a trade union our job is to support our members, both collectively and individually, and we will continue to support Rose's case."
Campaigner Jackie Nixon, who blames Maidstone Hospital for the death of her father, said Ms Gibb should not get any money at all.
"I am horrified," she said.
"She should realise too many people have suffered. If any money is paid she should immediately transfer it to a fund to help victims.
"It is the only humane thing to do."
The trust said it had no further comment to make.