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Unless you sold or gave her the bed she is obliged to allow you to collect it.
Unfortunately to pursue a claim like this must be done through the local court and as you are overseas, you would need to appoint someone to represent you, file a court application and ultimately appear on your behalf to press your claim. Likely it would not be worthwhile engaging a lawyer to take such action on your behalf, though if you granted your sister, or some other friend/family member as a power of attorney so she could act for you, then it may be possible. Keeping in mind the amount in dispute is only $1800 it may not be worth the trouble and time of pursuing an action in court, but that is a matter for you.
Alternately, you might simply engage a lawyer to write a firm letter on your behalf pointing out the legal reality and hope that if faced with the credible prospect of litigation, that she will give in.
I appreciate this may not be the answer you were hoping for, but it does reflect the realtiy of your situation.
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