If your mother didn't have at least $12,000 of income ($13,600 if she was 65 or older) then she would not need to file a 2018 tax return.
You need to file a 2020 tax return to report the gain on the sale of the house. If there were no distributions there are no K-1s to send out. As for expenses/deductions, they are pretty much the same things you can deduct on a personal tax return. The remodeling costs increase the cost basis in the house, and realtor commissions reduce the proceeds.
You can deduct the expenses incurred by an estate for its administration either as an expense against the estate tax or against the annual income tax of the estate. You may deduct the expense from the estate's gross income in figuring the estate's income tax
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