Congress (back when it was functional- you know, when the Dems were in control) passed a law codifying the VP’s role in elections is only to certify the results. So in theory she wouldn’t be able to question it the way Pence could have (though as I understand it, even the idea that Pence could have delayed cert was on shaky legal ground, but at least now that ground has been completely knocked out).

Ethically, you’d expect that since the VP is running for President that she’d step aside of the process and let the President Pro-Tem handle it (unlike Georgia’s current governor, who was secretary of state and refused to recuse himself from his own election) though I don’t think there is any legal requirement for her to do so.