In answer to your question - Will DBing work while dating? The answer is not that simple. My question is "Did DBing work in our marriages?" Well if success is defined by the answer "DBing got my spouse back for me" then I will say a resounding "NO". And most people here (and yes I know some people are in piecing and getting it back) will say NO. BUT...
DBing and working things out in your marriage are really 2 different things. Since being on this board and reading DB and DR - I have applied the DB principals to many aspects of my life and YES - dating is one of them and truthfully - YES - the DB principals can help you achieve the desired results.
For example - if something is not working - do a 180 - try something else. I applied this to getting my BF in the early days to call when he said he was going to call. This was a big deal to me. I wanted him to be reliable. When I explained to him that it upset me - it really didn't help. I tried that few times. Nope - didn't work. When I finally wasn't available when he DID call - that was a 180. He never ever failed to call when he said he would after that.
There are MANY other examples of DB principals that are effective in all relationships in your life. That one - "if something is not working - do something different" is one of my favourites.
So the answer to your questions is - YES - you can apply DB principals to dating. But I think your question really is "Will I get her back". And the answer is "Who knows"? Only you can decide whether or not you should try.