You're fine. :) I didn't use ammonia free. They probably just use it as an extra precaution because it doesn't smell as bad. Since you dyed it outside all is fine. No worries. :)
I just dyed my hair 2 weeks ago and used the same stuff. Your safe!!!
Its safe as long as you were in well ventalited area
Ammonia free dye is just taking that extra safety measure. As long as you dye your hair in a well ventilated area you're fine. Just no bleach! ;)