it's possible. pink eye is normally caused by a virus or a bacteria that causes inflammation in the lining of the eye, but it can sometimes be caused by environmental factors. it would surprise me if her eyes were reacting to the tobi but the rest of her body wasn't though, b/c environmental pinkeye (non-viral or bacterial) is usually due to allergies. so you'd think that if the tobi were giving her pink eye it would also be causing other signs of allergic reaction. does that make any sense? at any rate, i would bring it up with your doctor for sure.
just a sidenote: if the tobi is the cause then even your best efforts to keep it out of her eyes could be useless, b/c the mist is going to go into the air in general and her eyes are exposed to that.