Soy allergy?

I'm very suspicious that my daughter (1 years old) might be allergic to soy milk. On the 1st we began weaning her from milk by adding an ounce more of soy milk into her formula each day until it completely eliminated her formula. We finally were completely off formula by the 5th. On the 6st the baby sitter had called me at work letting me know my daughter wasn't being herself. She seemed to be sick to the baby sitter. She was laying around, crying more, wanting to be held, sleeping every 2 hours (she only takes 1-2 naps each day), everytime pressure was put on her belly she would cry. My initial thought was maybe she was constipated but the baby sitter reassured me she was normal with her bowl movements besides them being WAY MORE smelly (which now I noticed) on the 6st I noticed a small rash. I dismissed it until yesterday when she was increasgly getting more cranky and her rash had went all over her. (They are tiny dots all over her with some clustered together). I took her to the pediatrician and they did a viral panel which came back all negative. I noticed last night she was excessively gassy which smelt worse than ever (sorry gross), she was burping a lot, miserable, eveeytime she'd put pressure on her belly shed cry our, her rash is getting worse, and she's incredibly restless in her sleep and her cheeks are rosey red. Other than the symptoms lister above I haven't noticed any other signs of illness like a cough or anything.

Any other mommas have issues with soy? Could this be it?