No, go with your mommy instinct on this one, it is right! You should continue to avoid those foods. If you are unsure if it is milk, soy, or both, I'd understand considering trying one or the other to see if the reaction happens again. Unless you are sure it is both.
It is recommended that we wait until 12 months to do a reintroduction. No milk or soy for her either. That is no yogurt, cheese, and some moms don't even do cows beef because the protein mimics the milk protein so closely. At 12 months, I would try yogurt for YOU while still nursing. Wait a week for a reaction. Then you can try more milk products slowly. Add soy if the milk goes ok. If she is ok with both through you, then she can try yogurt herself and then on the same schedule posted for you.
The longer she is breastfed, the better her chances of not living with a lifelong allergy or intolerance. I think I posted this earlier, but my dd outgrew it at 18 months, my ds at 12 months. Some children take longer than that. But it was so worth their health to be milk/soy free as long as I was, and to continue nursing 12 mos/16 mos respectively.
Best of luck! And post with any questions.