Shiv, lots of hugs. I don't think I'll ever forget my "my body couldn't kill him while he was inside me so now its trying to kill him by not making enough food" meltdown at about 6-7 days. I went on to lose a piece of nipple, the tearing was so bad and still BF til 2.5 years. This feeding thing is so damn hard when its not easy, hats off to you for persevering. I found completely stopping all the mechanics of BF as taught helped, just putting L on my chest with me laid back about 30-45 degrees, head near nipple, he shuffled around and latched on his own and it was the first painless latch we'd managed. He was maybe 2-3 weeks older than your little one is now though - could be worth a try while she's calm/just waking from a nap? I later found a video of essentially the same technique called biological nurturing, I was just trying skin to skin to see if that would help...
FX the LC is able to help xx