You are doing fine. Remember that we are merely human and we make mistakes. The fact that you immediately apologized is great. I think you did the best thing possible.
Of course you are going to feel stressed and pressured right now, especially if she is nagging you for money. I suspect since you have given her so much space that she may feel that's the only weapon/connection she can create with you right now.
May it's time to come out of the dark and start experimenting a little bit. Or maybe it's time to do a 180. I know it is very difficult during this phase of DR to walk that fine line between being patient and gracious and loving from a distance and not get steam-rolled.
I'm a little lost on exact advice right now, since I'm not a guy and didn't have to deal with the child support issues. I would suggesting seeking out a successful man on the bb. COG comes to mind; I believe he is still active here. Just Me would be a good person to seek out too.
You are in my thoughts and prayers...keep doing what you are doing.