Honestly, it sounds as though this is a battle that is not worth fighting right now. If she cannot tell that she is wet, she is not ready, whether she is 4 or 40. My DS was the same way for a while. He would be sitting in wet pants and not even notice.
I do know of one little girl with SN who "magically" got trained when her mom told her Mickey Mouse didn't allow 4 year olds in Pull-Ups at Disneyland (just before a family visit to the park--we're about 40 minutes from DL). That worked for them, but I wouldn't necessarily recommend it.
I also know of a family whose son was in Pull-Ups through most of kindergarten. I remember his mom's excitement when she was able to announce to her friends that he finally was trained at almost 6.
You are not a failure. Your DD is dealing with lots of issues, and toileting just is not on her radar right now. She will get there when she is developmentally ready. (I know that's not easy to hear--I've BTDT.)
DS '04 "Boogaboo"
DD '08 "Lilybear"