I helped a family member deal with this a few years ago. We used TurboTax, same as I've always done for my personal taxes. There is a question toward the end that asks if you are filling out this return on behalf of someone who died. If you're familiar enough with tax laws to do your own, and her return is simple, TurboTax can handle it.
Part of closing out the estate is that any debts owed should be settled before any inheritance is paid out (which could include selling a house or any other significant assets). I'm sure taxes would fall into that category if she owed. However, if your mother didn't leave enough money behind to cover debts, you are not personally responsible for paying them off.
If there's a significant amount of money in the estate, you should probably consult an estate attorney or at least a CPA to make sure you're doing it right. Estate tax only kicks in if there are multiple millions there...but if you're asking an anonymous board of band directors that's probably not the case.