Well she's freaked out that's for sure, she's probably more bewildered and curious than upset. Of course it's not like you'd trust a random guy who shows up out of nowhere. I figure if I needed to bring Mickey in, he could have mentioned something about hearing strange stories about plastic coming to life, considering he could hear it around the pub or something. Otherwise the other thought would be to have Rose head off to the roof to get some space and clear her head, since a babbling guy with something on fire isn't really being helpful. If we wanted to have the plastics already attacking people, something could happen down below to catch their eye? (assume Nine follows Rose or doesn't) We could still have her get into the same sort of trouble from the canon episode if needed.