Daughter needs to give you the short certificate that designates her as executor to act on behalf of estate, or the court appointment if she doesn't have the short certificate. You know POA died with the mom, so once daughter gives you whichever document grants her the authority to act on behalf of the estate, only then will you be able to work with her again on behalf of mom and mom's estate. At that point, you could choose to have her sign a release to provide copies of returns directly to attorney, if you are comfortable with that. Otherwise if not, you will provide daughter with extra copies that she will provide to attorney herself. I don't see how you could possibly provide either of them anything today since those returns are not yet completed.
Sorry, can't answer about the paper vs e-filing. Depends on what document you get. Check instructions for form 1310. There was an extensive discussion a couple of months ago on here. I'm not in office right now or I'd look it up for you. Maybe later tonight I'll have time to revisit this discussion.