So does the nun back up her claim in any way?
The Pope is a conservative and therefore the burden of proof is on his side./Sarcasm off
A 1999 opinion signed by Ratzinger said Gramick and Nugent's teachings were "erroneous and dangerous" and that they "caused confusion among the Roman Catholic people." Both were ordered to end their ministry. Nugent conceded but Gramick chose to continue speaking out, eventually leaving her religious order.
Apparently she didn't think being a catholic nun required her to teach catholic doctrine. Silly former nun.