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Mother's recourse here is to file a legal suit called a "partition action" in court against the other owners of the property so that the judge will order a public auction of the properties and mother can "cash out" her interests. This is an absolute right that can not be denied.
However, mother will need to talk to a local real estate attorney where the property is located to get him to assist with filing the partition action..
She could argue that sister should pay 3/4 of the fair market rental value to the estate and that she is entitled to 1/3 of that money, she could file that motion along with the partition action. As for the checking account, if that was in aunt's name then it would not be an estate asset and is solely owned by the aunt.