I haven't had trouble with a recessed chin, it was me (inverted nipples
) I had loads of problems trying to get them all to latch on.
Has your friend tried feeding in different positions? One of the best ones was holding the baby in my right arm,on a pillow so i didn't get arm ache, and suppotring his head with my right hand and holding underneath my armpit and feeding from the right boob, then the same with the left breast. If you get me
Or when he's about to latch on pull his chin down so his mouth is a bit wider
Hope this helps
Tell your friend she's not a failure though, IMO b/f is really quite hard, even when your on your 3rd!!