The well-regarded member for Indi was allegedly struck repeatedly by a four-wheel drive in a deliberate attack outside her office in Wangaratta, northern Victoria, on October 19.
Dr Haines had both her legs amputated but is now in a stable condition.
Independent MP Kate Chaney, wearing an orange blazer and a cockatoo brooch in support of Dr Haines, urged other politicians to act with kindness. Compassion in Politics Australia pledge. Ms Chaney will add her name to it shortly.
"It (the pledge) is a very simple thing. It just says: in my political life, I pledge to act with honesty, respect and compassion," she said on ABC Radio.
Dr Haines was the first MP to sign the
"That feels to me like a simple and poignant way to honour the contribution Helen's made to the parliament and continue to try to embody those values that she personifies in the way that I do my work in parliament," she said.
Ms Chaney also wanted a better code of conduct to be applied in the chamber.
The Western Australian is one of several independents elected in 2022 who have benefited from the guidance and care of Dr Haines, who was voted in the term prior.
Labor members have also learnt from her behaviour, and it was incumbent on each person to act respectfully in their sector, Social Services Minister Tanya Plibersek told Seven's Sunrise program.
"Just think: Can I do this better? Can I be kinder to the people around me?" she said.
Parliament will open on Monday with increased security in public areas, which the Australian Federal Police and government are continuing to work on.
Liberal MP Dan Tehan said he wanted better security for electorate officers, too.
"As a rural MP, you're always out in your community in public, like Helen was. And I think that's just probably more an area where we need to be looking at," he told ABC Radio National.
It will be a solemn start to the sitting week, as politicians pay tribute to 65-year-old Dr Haines.
Prime Minister Anthony Albanese will speak first before others are invited to join him.
A fundraiser for charity Save the Children, set up on Wednesday by Dr Haine's family in lieu of flowers, had surpassed $1.2 million in donations by Sunday afternoon.
Despite the solemnity, federal parliament will continue wading through complex legislation and Senate estimates this week.
Labor's digital duty of care bill, aimed at curbing harmful content online and stamping out predatory behaviour from platforms, will be debated in the lower house later in the week.
The government aims to pass the legislation before the end of the year, but opponents argue it could result in political censorship.
The government has pointed to the alleged attack and rising threats toward leaders as examples of why greater action is needed against online harms.
Authorities are still investigating potential motivations for the incident, but the man accused of ramming Dr Haines with his vehicle, Brendan Nugent, posted prolifically on social media about political issues.
Senators will also brace for the first week of estimates hearings in five months.
The company responsible for the embattled Snowy Hydro 2.0 project will face a grilling on Monday over another cost blow-out that could lift the project's price tag to $25 billion.
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