Guys (and any girls out there, too),
Thank you very much for the responses. I really appreciate you taking the time to read and respond!
Note to WanderlustLA and Snarg: Thank you for the kind words of sympathy. Yes, it was devastating. She had cancer and watching someone you love pass away from that is something no one should EVER have to go through! It took a while to even consider moving on, but I have come to that point.
I started investigating PU because I've never really had much (or any) real game. I've had a few girl friends in my life, but always felt I just stumbled into those rather than getting into them because "I knew what I was doing". Plus there were many agonizingly long dry spells. I probably tried way too hard and was always the "nice guy" or "the friend" (based on my post at the top, I apparently still haven't quite gotten around that yet) and we all know where that gets you. My "statistics" are embarrassingly low for someone my age (~50), especially someone whose never been married and who even plays in a very good working local rock band! I would think that would be a sizable DHV!...I thought rock stars got all the girls!

Currently, my # = 7 (only three of those were long term at all) and SNL or ONS = 0!! Obviously, it's way past time for me to figure out what actually works (because the nice guy thing, obviously doesn't). I'm discovering there is a lot to learn (and probably more importantly, a lot to un-learn). I just hope I can figure it out and make it work…it's trying to teach an old dog new tricks!
As for this current girl, I thought she might have been trying to keep me "on the hook" with all of the "…friends, *for now*…" type of stuff. Maybe something will eventually develop with this girl, but I'm definitely going to keep looking in the mean time. Maybe she'll see me in a more equal (should really be higher!) light, soon when she comes to see my band play (though I've already mentioned to her that I play in a band). Hopefully, that will DHV me up a few notches.
Note to pumpington: I think I understand what you mean about screening. I guess I'm still trying to un-learn the "trying too hard…hoping she'll like me…basically, me over qualifying to HER" type of thing and I need to get into more of a frame where I'm screening her (making her qualify to me). That is, going from a "she's the prize" frame to an "I'm the prize" frame. Do you have any good tips on how to internalize that state-of-mind shift (other than, "just do it")? Also, as you can tell from my stats above, I guess I don't present a strong enough sexual frame (per your comments "…sex is a requirement to date you" and "…sex should be something you just make happen"). I wish I was at that point and it was that easy. Again, any tips on how to get there? Also, you said to "stop giving her attention". Are you saying I should basically not contact her or ask her out until she contacts me, or should I at least keep in touch somewhat? As I said I'm going to keep looking in the mean time.
As a more general question (i.e., not specifically about this particular girl)…as I said, I seem to keep getting these "not in a good place to date now" or "…just got out of a LTR…just friends for now…" types of responses, usually after a date or two. What phase of the attraction game am I most likely missing or misplaying? Not building enough attraction?, Not enough comfort?, Not qualifying?, Sexual Escalation?, etc. How do I get past this so I don't keep getting friend-zoned or can turn some of these around?
Thanks again in advance for any responses!