If you scroll back up, you'll see the quote from Meg I responded to was:
"There must be some kind of judgment from the hierarchy in order to carry out a legitimate sentence on the charge of heresy of a Pope. That's just common sense."
There is no mention of excommunicating a pope.
Yeah, you may have been just seeing her comment in isolation, but I was looking at it in context of what she was responding to. Fair enough.