I am sorry to hear what has happened. She would not be permitted by the law to hold on to your items. You may find that if she continues to do so, you may have to take her to court to have a judge order for their return or the cost for their replacement. I will explain to you however the least expensive way to go about this.
firstly, you are required to write a letter to her which, should be headed, “letter before action”. In this letter, you should state that you would like to have. The things returned or the cost to replace them. You are required to give her some time to amicably resolve this, usually 14 days.
secondly, If after the 14 days she does not return the items or respond to the letter, you may take her to court for the items/or seek the amount it would cost you to replace them. You may represent your self in going so. And, any cost incurred by you in bringing the action you may ask the court to have her reimburse you. It is not necessary therefore for you to instruct a Solicitor as you may represent yourself.
Hope I clarified things for you. Kindly let me know if I may be of further assistance.
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All the best