I've skimmed four chapters and I don't think she's disrupted the canon at all. The writing is a little overwrought, but a proper Austen style is hard to carry off. She's not over the top for a well-brought-up young woman of whatever vague time period PotC is set in.

That's not to say the fic is without issues - I noted a use of "Nigeria", which a quick Wiki check confirms is a name dating to 1897 - but the OC seems fine.

As far as I can tell she's off on her own plot (I left her heading to Tortuga to try and find some medicine), not even going pirate/Will/Elizabeth-hunting. So while I'm sure she'll run into them, her current plot is a "living in the canon" story, which doesn't have to enhance anything.

hS

EDIT: One way to try and answer your own question would be to start with the charge list. Not the minor things like SPG and little sillinesses, but the major ones. What does the character or the fic do that means it's hurting the canon so much that the PPC needs to kill it? "Suvian" is just a shorthand for a set of behaviours and issues, not something you need to look for separately.

It wasn't bad. Marion didn't seem very Sueish at all, at least in the couple chapters I read. I personally only try to report badfic with bad SPaG--it's a pretty objective charge.

--Ls also liked Eragon, so take this with a few grains of salt.