I am so sorry that you are still going through this. I feel the same as you, crazy!LOL. I have fought with my DS sleep pretty much since he was born. I keep thinking that this month is the month that he will "get better" but alas that is never the case.
I am thinking that OT is setting in but if you keep plodding along, you'll get there. I moved back and forth from one nap to 2, early bedtimes etc but really the only thing that worked for us was sticking to clock times and we are pretty much there. I still get NW but he settles himself after 2-5 mins so I don't really count them as NW. I am sure they are due to OT, but his naps have lengthened and we have a normal bedtime now. This is after 3 months. I shouldn't say anything as I know by saying it, I curse myself!
I used to run in every time he woke early from a nap to get him b2s but I think that this worked against me. My DS is a restless sleeper and wakes himself easily. I found that if he knew I would rush right in and nurse/rock him he wouldn't attempt to get back to sleep himself. After weeks of wi/wo during naps, and leaving him to settle a bit longer(10 mins)if he wakes early before I intervene he has started sleeping longer. I found that too much stimulation, like rocking made things worse as he is spirited as well. I find that I can read his cry when he wakes early, it's like " I am awake, but I don't want to be". Sometimes he just needs to work it out alone. I am always outside his room and he knows I am there, I am sure. I just try to hold off a bit before going in. By giving him 1.5 hours in his bed, with wi/wo and self settling, I think this has set his body clock. It may be worth giving wi/wo a try even if you have to do it for 45 mins-1 hour to get to 1.5 hours. It's worth a shot right?I did it several days to get to 2 hours. If she doesn't go b2s then you know you have given her the chance for a good nap. In this case, you may need to bring bedtime forward by a bit, but I found that after a week, it began to work.
I am no expert, but I do know what it is like to have a child who doesn't sleep according to any rules so giving everything a shot is well worth it. Maybe she will nap at 3 hours post wake up in the car. Even for a few days to avoid OT. There were a few times last month where I drove around for 45 mins just for a 15-20 min nap!