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Have you reported anything to the Police please?
Thank you for your question
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I am afraid that none of what you describe amount to harassment so far as the law is concerned and any attempt to ocntact the police at this stage would simply allow your husband to make further false representations about your behaviour.
There is no letter that can be sent (again at this stage) because none of her behaviour has crossed the legal mark.
At the moment the only option is for you to ignore her and not give her the satisfaction of knowing the upset she has caused.
Do not speak about her to your husband, then she will not be able to try and come between you - instead concentrate on doing things together that you enjoy and leave her behind
Please ask if you need further details
It is always difficult - but carry on your life and ignore them