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Hang in there, you're doing a great job! The first few months can be hard especially when you're having problems, but the hard work you put in now to solve those problems will be worth it.
I encourage you to take your baby to her doctor's appointment even if you decide not to vax right now. Your baby's health is too important to miss a doctor's appointment when you're concerned about weight gain just because you want to avoid explaining your decision not to vax.
I had a quick look at the growth charts, and your baby has certainly dropped in percentile. This by itself may not be a problem, but you really need to have your baby assessed by your ped to help you determine if there is cause for concern. Better to find out sooner rather than later.
To answer your question about supplementing, if it becomes necessary to supplement, then you should supplement first with any expressed milk you have, and if necessary, with formula. Your baby is too young for you to supplement with goats milk. Also, what you are able to pump is not indicative of your milk supply.
If you are finding it difficult to get the help you need with the LC at her support group, then consider hiring an LC for one-to-one help. An LC should also be able to tell you whether the flanges for your pump are big enough for you.
If your baby's latch is still not perfect, then it is something you need to continue to work on with the help of an LC. Since you have large nipples, it may take a little bit of time for your baby's mouth to grow big enough for her to latch on properly, but continue to work on it. You want to make sure that she has the best latch possible so that she can transfer milk effectively.
http://www.kellymom.com/babyconcerns..._increase.html
The above link has some good info on ways to increase weight gain in the breastfed baby.
Please see your ped, and let us know how things are going!