Title to real estate and title to personal property are two different things. Just because your mother deed her house to you prior to her death does not mean that she also left the personal property to you and your siblings equally. Your mother's will determines who gets the personal property. If you cannot come to an agreement amoung the siblings, you may have to hire a probale lawyer and probate your mother's estate.
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Mr. Deason is correct. The deed to the real property has no bearing on the personal property. This is really a probate question. If one heir is removing probate property, the executor should demand to have it returned and may take legal action if necessary to have it returned.
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I agree with Attorney Deason. In addition to that, if the probate case is now closed as you mentioned, obviously there was an Order distributing property of the probate estate. If your sister is now in contempt of the Order, you will need to go back to the Probate Attorney to file the appropriate pleading in Probate Court to stop her from taking further actions.
DISCLAIMER: This answer is provided solely for informational purposes only. This answer does not constitute legal advice, create an attorney-client relationship, or constitute attorney advertising.