Both are assur. Even if one can twist a scenario where one is “only” a dirabanan it is still assur (in fact, it might a bigger problem if someone says “its ONLY a dirabanan”). Whatever the case, this friend has apparantly straightened herself out. Why are we harping on how she USED TO act?
As for “echta viashuv” the mishna in yoma already tells us yom kippur is not michaper (not 100% certain what that means and how it applies…its been a while since I learned it – but whatever it means, it isn’t a good attitude to have).