The condition of injured MP Helen Haines has improved from critical to serious but stable after more than four days in hospital.

Ms Haines suffered critical injuries on Monday when she was struck by a vehicle outside her electorate office.

Police allege the incident was a deliberate attack by 43-year-old Tarrawingee man Brendan Nugent, who faces multiple charges.

On Saturday morning, the Alfred Hospital in Melbourne said Ms Haines's condition had improved and she was now stable.

Ms Haines lost both legs as a result of the crash.

It's the first improvement to her condition since she was flown to hospital after being pinned between vehicles outside her office on Monday.

The horrific incident led to Ms Haines's left leg being amputated on Monday.

Her husband, Phil Haines, then confirmed on Wednesday that her right leg had also been amputated due to the extent of her injuries.

Mr Haines described his wife as a fighter and said he and loved ones were hoping she would recover from her injuries.

"Her heart is huge — she is a very compassionate, caring, loving person, incredibly supportive of all around her," he said on Wednesday.

"And her mind — she has the sharpest intellect. She has always had the most intense desire to learn, to read, to synthesise and to understand what's going on.

"We are grateful and thankful that, at this stage, both her heart and her mind are in good shape."

Floral tributes continue to be added to a growing collection outside Ms Haines's Wangaratta office.

Colleagues of the popular MP say they've been overwhelmed by the kindness shown over the past week.

Last night candles were lit across the country in a show of support for the 65-year-old.

On Saturday, Save the Children Australia confirmed that more than $1 million had been donated to the charity in her honour.

"It's a remarkable response, and a reflection of the enormous respect and affection Australians have for Helen," a spokesperson said.

Wangaratta barber Ricky Jefferies, who ran to assist Ms Haines in the aftermath of the incident, said the update regarding her health would be welcomed in the community.

"I take a lot of pleasure hearing the positive improvement in her condition," Mr Jeffries said.

"I know the whole community will get a lot of joy hearing that, even if it is just a little bit for now."