It's not just about her 3 victims that tried to commit suicide, were hounded out of their towns, still can't find employment, etc.
It's the domino effect of racial hate crimes she created. According to police, hate crimes in Barrow tripled that summer. Barrow police recorded 150 incidences linked to the Elly Williams case – that will just be the formally recorded cases, not the ordinary threats and slurs and attacks people endure in public places and schools daily. For years, family homes and businesses were vandalised and attacked nightly, and of course the family businesses lost their livelihoods overnight.
Being racially targeted, day after day and night after night in your own community is like a living hell-scape of fear. You know you're vastly immediately and societally outnumbered.
I've never experienced it on this scale of course, but as a foreigner, I moved away from the UK back to my own country because of this fear. Not that the UK is an inherently racist country (though Barrow was clearly an intensely racist place by that stage), but it's that feeling of never being safe even when you're home, because of who you are.
Apart from threatening interactions when I lived in certain areas, there's also the societal element. One of my friends from my country was badly attacked by racists in a case reported in the news and the public didn't even bat an eyelid – in fact, the police didn't take it seriously until my country's embassy got involved – so I know the same would go for me too. There've been lots of similar cases too where the same happened. It would be their word over mine. Worse in Barrow after Elly Williams.
As a woman of colour especially, white women will never know that awful physical and mental fear. But for men of colour, especially in known racist places, I don't think the physical element helps because any self-defense will count against them, and generally the system/public reception take racist crimes as a joke.