"London stands in defiance", said Khan.
"She was a friend to many here", said Kathy Christiansen, executive director of Alpha House, a shelter in Calgary for people suffering from addictions, where Archibald was a social worker until a few months ago.
"We've had a number of people who've kindly donated in her memory to Alpha House since that hashtag started".
The most recent terrorist attack in London gripped the world over the weekend. Others who had been arrested were released without being charged.More news: BREAKING Jeremy Corbyn says Theresa May must resign after London attack
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"My focus from Saturday night has been working with the police the emergency services and the government to deal with the horrific attack on Saturday", Khan told Sky News, when asked about Trump's latest tweet.
Forty-eight people were injured, 18 of whom remained in a critical condition on Monday.
Islamic State, which is losing territory in Syria and Iraq to an offensive backed by a US-led coalition, said its militants were responsible for the attack.
"I think Sadiq Khan is doing a good job and it's wrong to say anything else - he's doing a good job", she told reporters at an election campaign event in London. Khan had earlier condemned the attack and said there was no reason for people to be alarmed by the sight of Armed police officers, Trump said.
In a Sunday tweet, Trump mischaracterized Khan's remarks by suggesting the mayor had said there was "no reason to be alarmed" about the attack itself. "We grieve the loss of our lovely, loving daughter and sister". She had room in her heart for everyone and believed strongly that every person was to be valued and respected. The three suspects Saturday were shot within eight minutes. It amplified the following day, with the president lashing out at what he called Khan's "pathetic excuse". Masood was shot dead by police.
The Amaq news agency, which is affiliated with the ISIS group, said the attacks were carried out by "a detachment of fighters from ISIS".
In the northwestern English city of Manchester, 22 people died in a suicide bombing on May 22, and 116 were injured.
A vigil will be held in central London on Monday evening to remember the victims of the attack.