I've kind of been... refreshing my email a lot today, waiting for this to come through. NB's R's for partials seem to take a week or less for everyone, so I thought today might be the day. And it was!
This sounds like a form R to me:
Dear Mindi, Thank you very much for sending the excerpt from THE FAKE MCCOY. I think you're a talented writer and you have a clever premise, but I'm afraid I just didn't quite find myself connecting with the narrative enough to give me confidence that I'm the one to make this stand out in such a competitive marketplace. Opinions vary considerably in this business, and I hope you find another who feels differently. Thank you for the opportunity to get to know your work, and I wish you every success. Nathan