Well it all depends on the source of the problem.
A financial advisor isn't the right resource, that name is a misnomer. They mostly just sell investment products. They really should have a different title because it's incredibly misleading. Some are more educated and can provide really great investment advice, but they're still not actually personal finance advisors, more like personal investment advisors.
There are money coaches, and this *may* be the right path to take, but the credentials of "coaches" are highly varied. Most financial coaches I know don't have any particular expertise beyond what a decent personal finance/budgeting book would have. But if all that stands between her and financial responsibility is a bit of accountability, then even with minimal credentials, this could be helpful.
However, if there's a larger impulse control problem at play here where she find it hard to control her spending and has psychological blocks to managing her money responsibly, this is therapy territory.
So the question is, is she just someone who never gave personal finance much thought, kind of stuck here head in the sand, and is now growing the hell up and determined to get her house in order?
Or is this an issue she's well aware of, has tried to control before and failed, and has anxiety about dealing with?
Basically, is her debt a product of dumb, childishness that she's matured out of, or is it a self-destructive maladaptive pattern that is persisting into her adulthood?
The thing is, these aren't really your questions to answer. They're hers.
Good luck though, and congrats on having honest money conversations at this stage of your relationship. That's a great sign.