Well, she emailed me today (only days after I'd emailed her the 400 pages), and she said she "pulled an all-nighter" -- that she read the entire thing! She was so sweet and complimentary, and gave me detailed feedback, which I was so grateful for.
The very best compliment I could ever get is that someone read my book that quickly - because that means (hopefully) that he/she was absorbed in it, which is part of my goal, as a writer - taking readers into a different world and getting them "lost" inside it. How wonderful!
Anyway, all this was a much-needed jolt of confidence for me, especially after that Penguin rejection and more re-writes to do over these holidays. So, a big shout-out/thank-you to this particular person for making my day!! :-)
And a big HAPPY THANKSGIVING to all the readers! I hope you have a safe, healthy, and wonderful holiday!