Was exactly what I was looking for.
I doubt BSL is terminal for her too-- I brushed it out fully recently and it's definitely thick to the ends, no fairy tale wispy ends or anything. It's so gorgeous.
She washes 2-3x a week at most from what she tells me.
No she doesn't brush it when wet, and she has a wide tooth comb that she even left at my place from her last visit, I'm looking at it now.
She uses a straightener occasionally, and she's not a swimmer. She blowdrys sometimes but usually, air dry.
No scrunchies, just hair ties normally. No metal.
Wearing it to sleep? Either loose or in a cap which she got actually. Occasionally a braid, too. My learning to braid it might be a fun idea, thanks!
Day-to-day is either down or in a braid, generally. If it took her 2 years to get to BSL it will probably be 2 more years to waist length  but I'd rather be patient for that as opposed to her chopping it off.
 but I'd rather be patient for that as opposed to her chopping it off. 
Pictures might be a good idea. Maybe I'll see if I can work that in.
Thanks again for your input!
-VK