Have you tried using a finger to pull her chin down a bit further? I used to do it with Jesse. Just to hold his mouth open a bit while I get the nipple in.

Have you tried expressing a bit so your boobs aren't as full? Then you could try, umm, kinda flattening the nipple to go in her mouth iykwim. Squeezing it a bit to make it an easier shape to fit more in? Does that make sense at all?

Your doing great hun. We are all here with you & we've all been there too An LC would be a great idea x