Hi and welcome to JA.
My thoughts: if the contract of sale has been approved by the court, the proper way would be to make out the check to " your sister as guardian of XXXXX XXXXX". I don't know why it would be returned to you. The contract approved by the court is "XXXXX XXXXX as guardian of XXXXX XXXXX" as seller to you as purchaser. The check should be made out that way. The deed is going to be made from "XXXXX XXXXX....." to you.
Also, if the court has approved the contract of sale, your sister has no right to keep postponing the closing. I would have your lawyer send a letter certified mail RRR to her or her lawyer stating that if the closing doesn't take place by (a date you select)you will go to the court to force her to close, accept the check and give you the deed.
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