Your question needs some explaining. Why do you need to end the trust this year? How many beneficiaries of the trust are there? If you and your sister are the only beneficiaries, you will have to buy out her share, or sell the house and divide the balance.
Not sure of the particulars because if the trust says to distribute the house to you that is what you should do - you can deed the house from the trust to the two beneficiaries then beneficiary one can buy beneficiary two out. Or I suppose you could do it all in one swoop.
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The particulars depend on your ability to buy your sister's share of the property. If you have the cash available, then the present attorney should be able to help you finish that task very easily. If you cannot pay the purchase price with cash, then you will either have to borrow from a lender or buy your sister's share in an installment sale (some people call it buying "on contract") documented by a lawyer like a normal installment sale of real estate.
You have a fiduciary duty to deal fairly with your sister, so you should take steps to show diligence in determining a fair price. I suggest encouraging her to hire her own lawyer to advise her the transaction so that she cannot accuse you of taking advantage of your trustee position later. That may sound crazy, but independent representation can avoid hard feelings later.
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