This website has GREAT info on breastfeeding, infant sleep, etc. www.kellymom.com If you're still nursing her, (congratulations, by the way) that's the most important thing, even if you feel like your supply is dwindling. Keep it up, sometimes the supply fluctuates. You can try to increase your supply (there's info for that on the kellymom website).
Keep nursing because that's the only way to keep up any supply. After she empties mom, if she's still hungry, try a bottle of.. whatever she'll take, really. It wasn't *so* long ago that 10 months was the recommended age for switching from formula to cow's milk, (mid-90s). Some people also use goat's milk, although I think that's due to it being easier to digest than cow's milk. (And good luck finding *that* in organic.) Talk to your pediatrican or a lactation consultant about it. Keep trying the formula, because she could come around, but... it does taste pretty awful, so if she doesn't, give her what she'll take.
And if she keeps refusing formula, and you go with cow's or goat's milk, I would add Poly-Vi-Sol WITH IRON (vitamin drops) and a DHA supplement. The packages for regular Poly-Vi-Sol and the one with iron are nearly identical). For the DHA, I get Nordic Naturals strawberry flavored from the children's section of Whole Foods. It's basically flavored fish oil. My kids call it their "yummies". My pediatrician recommended both of those, even though we had no nursing problems. (Check with your pediatrician obviously.) DHA is being put in all kinds of things these days, including Horizon Organic milk. But, they charge a lot more for it, and if you just get a DHA supplement, it works out cheaper.