Congratulations—that is something to be proud of. I can see it being a real problem for that degree. At the same time, it won’t affect 99% of those studying at Catholic Institutes in the U.S.
Even in those places that will be affected, it will take a couple years before changes are actually put into place unless the institution was already leaning in that direction.
I’m guessing that, being from the States, she would have picked up a B.A. followed by an S.T.B. before the S.T.M. If you come from Europe and skip the B.A. stage, there is a gap in education. If she is going on for an S.T.D., it could be a problem.
What is her field?
She's actually taken a couple of summer classes at the Pontifical Faculty of the Immaculate Conception (a/k/a the Dominican House of Studies) and it wasn't considered a problem at all.
I'm done paying for it (Woo-Hoo!!!!)
But if she, at some point, wanted to go back to get her STL or STD, it wouldn't be a problem at any pontifical faculty. And if she chose to pursue a non-canonical degree, it also wouldn't be a problem, as her degree is recognized as a Master's Degree by the Government of Austria, so it's transferable as well. (Having said that: her money, her business...going forward)