No worries!
2h40 seems to be her sweet spot. If she short naps -- don't care the reason -- then I'd shorten A time by 15 minutes. Silly babies seem to have a thing where even if they are EXHAUSTED due to a short nap, they still need a certain length of A time: shorten it too much, and they give you another UT nap! But go the full length and they'll often have an OT nap!
Just tell her she can't drive until she's 21 b/c she tortured you so as an infant.
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Yes, a good CN will often help with the BT and NW problems. The more rested they are at BT -- having a good CN and the right A time should do it -- the better they sleep at night. Of course, missing out on daytime sleep will still cause problems. But we'll get it unraveled, don't worry!
Sorry for not writing sooner. We went out of town for the weekend. but i'm back now!