Hunny, do use a pillow?
I just thought if you have a pillow you could use it to help hold her level with your nipple. Maybe even 2 pillows.

Laying down is hard. It did take a bit to get the hang of it. The one thing to remember is to make sure her feet & bottom are right in as close to you as possible.
I can't be right on my side or flat on my back. Sort of in between iykwim. Unless I am on a pillow with DS on the bed. Silly side ways boobs! Lol!!
I only started feeding laying down out of sleep deprivation & desperation!

I've seen those sheild things that Saram(?) was talking about. They are like plastic booby shells that have a hole on the inside layer that your nipple sits in. They looked interesting. I didn't try them though. They weren't what I wanted at the time.

I'm trying hard to think of more ideas to help. Having her higher up on the pillows might bring her chin up so you can actually see the full attachment. You should be able to see the bottom lip & the 'special K' seal.

Has anyone checked that her bottom lip is curling out properly?
I was holding DS's bottom lip down to make sure it curled out. & to hold his mouth open a bit wider to try helping with the attachment.