I can only give you an answer based upon the laws of the UK mainland. The situation may be different in Jersey in which case you would need to contact a jersey lawyer
On the mainland there are some things you can do.
You can apply for an injunction to prevent her selling anything. You could do that in an emergency basis because of the timescale she has given you. There is no reason why you could not apply for that injunction on the mainland and serve it on her in Jersey.
However even on the mainland if she gives you a Torts Interference with Goods Act notice it would only give you 30 days to get rid of the goods anyway failing which she could dispose of them so it’s only going to be a short-term remedy in any event and the fee for that is GBP300.
That’s the court fee alone without even starting with solicitors.
You may find that a strongly worded letter from a solicitor threatening a court application and an application for costs, may focus the mind without actually the need to get to court.
Check your house insurance to see if you have legal expenses cover that would pay for the legal cost of taking this to court.
Unfortunately, you can’t beat her with a stick until she capitulates and agrees to play nicely and if she doesn’t, your only remedy is to take her to court.
Can I clarify anything else for you?
I am happy to answer any specific points arising from this.
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