I would get a local solicitor or the Citizens Advice Bureau to write to her reminding her that there were witnesses to this incident and that it is in the best interests of all concerned to close this sorry chapter.
She should be told to make your belongings available on a date to be agreed to be collected by a friend or relative you both know to avoid any contact between you. Should she fail to make them available within a reasonable amount of time, say, a month it will be assumed she intends to keep them and hence stolen them.
I hope this assists . If there are any further points please reply I will be happy to respond.
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