Liz, I too hate the "good"/"bad" babies depending on if they sleep through or not! Having said that, I was BF'd until I was 4 months and slept through (a "good" baby) from night 1. My sister was the same and didn't sleep through for years. It really is subjective.

However, the best thing you can do for your friend is to get her on here. Pre-pregnancy (and pre-BB), I planned to BF "if I could", switch to formula/solids as soon as teething started, didn't want to co-sleep (although would have the baby in the bedroom) and didn't really have any thoughts as to weaning age (just not BFing with teeth). Now I am going to BF until self-weaning, no formula ever, no solids until six months or later, and I'm gutted that I won't have the baby in bed with me, but in a cradle at the side (but I really don't trust myself to wake up if I roll onto the baby - I can roll onto pins and scissors and not wake up). Research for yourself and changing "normals" change your mind quicker than a friend's opinion!