It sounds to me like your "mommy meter" is up and running accurately. What I mean by that is that you feel like your baby is fine, but someone else is telling you that she's not (which is clearly false). Listen to your instincts when it comes to your child. Even "experts" can be wrong.
I confess that I'm not a member of LLL--I joined this forum when my youngest was nearly weaned--but I disagree about LLL being a bunch of breastfeeding nazis. LLL has a wide variety of members, which vary from group to group. You might find that LLL is a more appropriate support group for you.