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Personally I wouldn't worry too much about the crying considering she wants more. Try to find out if it was a good or a bad cry. Sessions like that, for one, can trigger a release that doesn't directly have to do with the pain and isn't at all a bad thing. The one time I had a release like that I didn't even know what it was about, and I'm pretty sure it wasn't the sensation of the massage I was receiving at the time. It's draining though, so her sleeping is also something I wouldn't worry too much about.
The peaking.. you didn't give her any rules on closing or averting her eyes, did you? That would be the first thing I thought of.
Perhaps she meant reaching a "peak" of some sort, something having to do with a cathartic release perhaps? Sorry for freaking out on you, maybe?
I don't know. My magic 8 ball is out of commission. Probably best just to ask her, and ask her about the crying, to clear things up while you're at it. Personally, I find that if I wonder about something the chances of getting an answer are greatly improved when I ask the person concerned directly about whatever is one my mind. That's still possible in the set up you've arranged with your neighbors, or not?
Edit:
Never mind, I just realized you were only asking about the terminology. Sorry, I always get a bit - somethingsomething - when I see posts like "She said XYZ - what do you think she means" When the answer is clearly asking her, not a couple of strangers.
So, terminology. BDSM for Dummies mentions a peak, which is the point where ... wait, let me quote it.
"Many scenes can reach a peak (In which a bottom either safe words, or comes very close to safe wording)"
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