Sometimes as my ds gets older, I find myself distracted breastfeeding. I am just not *in* the moment, I'm already thinking about the next task. So I have been trying to have a glass of water a while before I nurse, and when it's time, we sit down, I play with his hair or just think happy memories, and relax. It helps!
If you're still having problems, you could try pumping for your let down and then putting her on. I'm about to get my period, and notice there isn't much milk and a very slow letdown. It will get better in a few days for that reason. Last thought is that slow letdown teaches them patience - LOL - but try explaining that to them! :wink: