Whats wrong with my friend. She got me a job, now wont talk to me?

Actually we worked at a diff company and now I work where she works. The people liked me and she said good stuff about me, now she wont talk to me now that I work here but talked alot at the old job. She act snooty and commented on my clothes one time. I dress business casual like everyone else but she wear all business. Is she snubbing me or what could it be?