Caroline Criado-Perez, from north London, was subjected to a string of violent and obscene messages after she was involved in a campaign to have a woman's picture printed on a new banknote.
Yesterday, she claimed police had lost evidence linked to the case, which was denied by Scotland Yard, and criticised officers for a lack of sensitivity.
She said: "It's just appalling. I got an email saying 'why don't you go through what you've had' from three users with certain handles.
"It just shows such insensitivity to someone who's been through so much, I can't believe it. I've spent the afternoon crying just from the awfulness of it.
"They wanted me to go through all the Tweets again because of their incompetence.
"Every time I have to go through it it's reliving it all over again."
Ms Criado-Perez received a fresh stream of violent rape threats yesterday.
Scotland Yard said yesterday that officers are trying to contact the campaigner to talk about the case.