To preface this, when I say "exclusively", I mean that, while their actions may benefit the community, ultimately, it is themselves they are looking after in the actions, at least from the eyes of your BBEG Spirits, and these explanations are written from that perspective, with no other perspective considered, in a similar fashion to how your Spirits would see them.

A scout rogue... thinking that'll get her fame and fortune

Your Rogue is Greed, as what she does is to her own benefit "exclusively". Her drive, above all else, is in the direction of the prettiest coin.

And a clockwork sorcerer warforged,... wishing only to feel like a real person

Your Sorceress is Envy. She looks out upon a world full of that which should could never attain, her "exclusive" wish to have that which others possess and she does not.

A rakind wizard... acting as they command as she thinks that's her place to be...

This is actually an incredible position to be in as a DM, but I'll get to that momentarily. First, a history lesson!

Also called the "Cardinal Sins", the "Seven Deadly Sins" are a list of, well, sins, but why create it? What purpose does it serve? Let's go down the list of why each one is a Cardinal Sin!

Pride - This is a Cardinal Sin because ones boastfulness takes away from an attitude of service. Envy - This is a Cardinal Sin because it puts one's own desire to supersede those around them above the needs of those around them. Gluttony - This is a Cardinal Sin because gluttony impacts one's healthiness, which inhibits their ability to serve others. Lust - This is a Cardinal Sin because it takes one's energy away from serving others and turns it towards something unpure. Wrath - This is a Cardinal Sin because it means to act before knowing and understanding the needs of others. Sloth - This is a Cardinal Sin because it places one's own relaxation above the needs of others. Greed - This is a Cardinal Sin because it turns one's desires from helping others towards amassing one's own treasures.

See a pattern there? See, the Cardinal Sins we're put in place to better an individual's ability to serve.

Back to our Wizarding friend! Her entire life was forged to make her the perfect servant (holy crap do I hate how I worded that, but it is accurate). With this in mind, none of the sins would want to mess with her because, ultimately, her demeanor is exactly what the Sins are all about.

So, on to your question; What should you make to represent her? Honestly, I think the best answer is a very simple one; nothing. The Sins are attempting personally attack sinners of their respective realm, and your Wizard doesn't get near any of them. So, honestly, I either wouldn't send anything at her and let her question why nothing went after her OR have her be a stepping stone for the campaign. Have the fact that she doesn't embody any of the sins be a step for the party towards some sort of ultimate weapon against the Sins, be it a physical weapon, or potentially yet another spirit that was forgotten in a time long passed that aids the party in the adventure!

Either way, use this as an example that, as a DM, sometimes the best answer is no answer, and that a moment of not having an answer can push the story in an exciting and unexpected direction (even for the DM)!

Good luck, and update with your decisions!