Suppose a student complete 1 year of a masters degree (2 year program). She then decides to accept a job. Later on, she wants to apply to a PhD program. Would it look bad if she didn't finish the masters program?
No, I do not think it would be a problem provided you work in a field close to your PhD area. If you get relevant experience, it helps to get into PhD.
Many university (at least in US) allow direct PhD admission for qualified BS students. So, if you are able to do some good work in your job, it can help you in applying for a PhD.
The reason I am emphasizing "relevant experience" since otherwise you may have to justify quitting the Masters program. The admission managers/professors may tend to suspect your staying for PhD.