The latest tragedy comes as the Home Secretary appeared to set himself at odds with the Prime Minister over how to respond to rising knife crime.
The home secretary said he wanted a "legal duty" on government departments to help prevent serious violence.
"If there was no correlation between crime and police, then you wouldn't have any police at all".
A former head of Britain's biggest police force accused the prime minister of being personally responsible for the crisis because of her squeeze on police funding and a weakening of powers to stop and search suspects.
South Yorkshire Police attended a meeting with Home Secretary Sajid Javid today as concerns of a national knife crime emergency grow.
Mr Javid met with senior officers from the Metropolitan Police, Merseyside, Greater Manchester, West Midlands, South Wales, South Yorkshire and West Yorkshire as well as representatives from the National Crime Agency and National Police Chiefs' Council.
Earlier, Ms Thornton told BBC Breakfast that "emergency funding" was needed to tackle the problem.
"That's why I asked the year before last to get more money and to have more officers and was given a small amount".
Media captionKnife crime: What's it like to be stabbed?
The 17-year-old was stabbed at 9.25pm, and despite the efforts of cops and paramedics she was declared dead an hour later last Friday.
Police at the scene of the murder of 17 year old Jodie Chesney where floral tributes have been left.
Dr Tim Bateman, Reader in Youth Justice at the University of Bedfordshire, has said "getting tough on young people who carry knives is misguided and unlikely to address the problem".
She said less resources for forces meant fewer arrests were being made and fewer people were being charged.
Jodie's grandmother, Debbie Chesney, wrote on Facebook: "We don't want anyone else to go through what our family is suffering right now".
'People are dying on the streets, young people are dying on the streets and we need to tackle it'.
At a Cabinet meeting on the issue of knife crime on Tuesday, Mrs May said the killings of Jodie and Yousef last week were "absolutely appalling" and told ministers her thoughts and sympathies were with the teenagers' families.
"We're taking action on many fronts & I'll be meeting police chiefs this week to hear what more can be done".
Theresa May, though, has denied a link between violence and police cuts.
Home Office stats show the number of stops has gone down from 1.2million in 2009 to 300,000 a year ago.
Knife crime is on the rise nationally and there were eight fatal stabbings in South Yorkshire a year ago, although locally knife crime is down by 12 per cent.
But Donna Murray-Turner, who chairs the Croydon Safer Neighbourhood Board, does not believe more police officers will solve the issue.