Absolutely every ounce of fight you put in for your daughter means boatloads. The absolute worst were the ones when one of the parents simply didn't care, even if that parent had been abusive. You, a good father, fighting for your daughter, will mean a lot for her, even in a worst case scenario.

You're doing the right stuff, and you know it. We'll all be praying for you/sending positive thoughts your way. I'll be praying for your ex as well... pain makes people do stupid stuff. The best case scenario is really the best case for both sides.