At about 8 weeks she's starting to become a little more aware of what's going on about her so she's having a look, it's a good thing, it's showing all that glorious breastmilk is doing what's supposed to; giving her superior brain function 
Babies go through stages where they will take lots and lots of milk and will put on ounces and ounces and other times they'll have periods where they take just what they need and will only put on so much. So long as she is content and seems satisfied with what she's taking and she is well hydrated then she is having enough and therefore you are producing enough. It's a very efficient system of supply and demand, you will make what she needs.
Don't worry about percentiles and whether she drops down one at one weighing session or goes up one at another, one weight measurement means nothing when taken on it's own.
In new red books, as of from (I think) June 2009, the percentile charts are made up of measurements of 100 healthy, exclusively breastfed, babies worldwide(in the old books they used to be made up from measurements of formula fed babies in Britain). All of the measurements are of babies who are a healthy weight, whether they're on the bottom or the top of the chart they are healthy weights.
Take cues from your baby as to what she needs, have lots of skin to skin cuddles to help stimulate the right hormones to get your milk flowing. Feed her often, offer the breast lots and let her feed for however long she wants and then offer the other breast too but if she doesn't want it don't force her, she will get upset and then so will you. It's a very natural process so be natural about it and give her what she wants when she wants it.
Do you have a support group, bfing cafe type of thing near you? You'd probably find it helpful to go along and meet other bfing mums to share experiences. Ask your 0-19 team or in your local childrens centre about one.
No need for tears, you sound like your doing fine