Thank you, sativa indica pits, Myles117 and STLbudz! I truly appreciate the feedback!
I basically agree with y'all: its a shemale and needs to go! Far as stress-inducing events, the grow space has had consistent light and temps, and nothing that should stress her into hermi-ing. I think she's a dud, although I'm not yet ready to diss HSO. Still, a number of other strains are doing just fine under the exact same conditions, all are starting to send out pistils and stretching.
Pits, no I don;t have a shot of the full plant, but she was topped (UncleBen Style), yielded a few clones that are rooted and has been LST'd into a beautiful bush. S/he may have grown bette untopped in retrospect, but I veg plants til I can take 3 clones: The apical stem and the 2 lowest branches, while still leaving 4 or 6 main branches. Then LST em flat and veg another week before throwing em into 12/12. ITs worked great and always yields me at least 1 clone, typically 2 or 3. This'll be my first non-bagseed hermie though, and the first time I've had to kill a plant, other than a beautiful Old Time Moonshine X Purple Urkle that had to go mid-grow, just to stay within legal med plant counts when Montana changed its med law... for the worse!
Fortunately like I said my flower space is overcrowded, and while I was looking forward to a solid, heavy-hitting purple strain like PTW, well she won't be all that missed as she's the least vigorous of my current grow... and now a hermie.
Good news is that her hermi-ing is basically just making my next job easier: choosing which one to cull. 7 minutes til lights out, so I'm off to yank her/him now! Adios, PTW, and thanks RIU!