Weight issues here too, but DD is doing SO well. I think sometimes we get so hung up on weight and curves and "average" (myself included!)
Yes, you may have had a dip with working crazy hours and not taking care of yourself as well as you may have done otherwise, but she's also 6m, probably moving about more, so using up the calories that are going in more quickly than she would've done when she was sedentary.
Lots of water, as much rest as you can, oats and keep on keeping on. Prolactin levels are highest between 2am - 6am, apparently, so if you're doing NFs, then would probably be the best times.