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If you want to keep nursing, I would start again as soon as possible to build your supply back up. The dairy and soy won't be out of your milk yet, however. If she is having a strong reaction to your milk, I would suggest pumping more frequently to maintain your supply. I had to cut dairy for a few months, but my DD never seemed miserable. She had reflux and mucous poop, which went away when I cut the dairy. Because she didnt really seem bothered by it, I didn't use formula. When she was about 6 mo, I was able to introduce small amounts of dairy back into my diet without it affecting her. A few months after that, I was back to eating whatever I wanted. It's different for everyone, obviously, but a lot of babies grow out of intolerances. Do you have a local le leche league? I bet they could provide advice. Good luck, mama!

I would keep breastfeeding her because she is more efficient at emptying your breast than a pump. To build up your supply, drink lots of water, gatorade, eat oatmeal, make dairy/soy free lactation cookies. I never stopped breastfeeding my DD when we were doing the elimination diet. But like @Zbug said, if she's having a strong reaction to the dairy and soy, pump as often as you can so you don't lose your supply more.

Good luck! Here is a MSPI thread that has a lot of great advice and helpful tips! http://boards.hellobee.com/topic/who-is-dealing-with-a-dairy-intolerance-or-mspi