Well, it's official: I no longer trust Ms. Raifort and I think she's going to become a villain in the DLC. Here's why:
1. I couldn't help but notice, after showing her all for Ruin Legendaries, Ms. Raifort specified that while she would have rathered searched for the Treasures of Ruin herself, it was best if someone "pure of heart" obtained them, implying she herself is not.
2. She mentions prior to the quest that only someone pure of heart can quell the Pokémon long enough to keep them from going berserk, further implying she would've done the opposite.
3. Upon showing her all four Treasures of Ruin, Ms. Raifort exclaims how eager she is to know more about them, but "will allow you to have them for now," implying she will eventually [attempt to] take them from you.
4. Finally, her token of gratitude for you is the TM for Nasty Plot. I don't know about y'all, but this gives me mad Volo vibes (Back Strike, anyone?).
I'm sorry, but I just don't trust her anymore. I think we best keep an eye on her, like she said she will on us. I think a betrayal is coming soon.
I'd also note her academy ace team is interesting, they easily could have given her 6 Pokemon with obvious historical ties but instead she has a Pokemon that is known for luring prey close (Lumineon), a pokemon known for tricking people (Zoroark), A pokemon known for controling its foes minds (Grumpig), a pokemon that likes to ambush (Seviper), a pokemon that knows the move thief (Scizor) and her Tera Pokemon is Gengar a Pokemon known for hiding in the shadows and being cursed. I don't know if she will be a villain in the DLC but they certainly have laid the groundwork for it to be possible if they want to go in that direction.