A personalized manual would, indeed, be helpful!
My biggest concern about moving to one nap is that I'd have to put her down early (noon-ish at the latest, probably earlier) and then she'd probably only sleep for 1.5 hours. If she wakes at 1:30 PM, she'll have a tough time making it to a 6:30 or 7 PM bedtime, but if I put her to sleep any earlier, she will likely wake up early. I really want to avoid 5:30 AM wake ups again!!