I am not a court-appointed personal representative, but I've been handling her financial affairs (including her tax returns) for several years. There are no other relatives and not much of an estate. As the person responsible for your sisters property, you would be the one to file the return.
TT says to fill out a Form 1310, but I have already submitted a paper one. I don't want to confuse things by e-submitting another one. You really won't confuse things that much. The IRS will see it has the same information on the same form.
If I don't complete the (unnecessary) Form 1310, the return has to be mailed. But a mailed return requires the taxpayer's signature ... which obviously can't be done. Just resubmit it with the e-filed return.
The 1040 has a line for allowing a "third-party designee" who can discuss the return with IRS, but says nothing about a non-taxpayer signature. You would be the third party designee
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