She didn’t tell Ron and Harry nor Draco about her dire finances. Ron and Harry would suggest she drop out of uni and get a "real" job at the Met police with them. Both of their fathers worked as police officers as well as Ron’s oldest brother who was an undercover detective now. It sounded like a nightmare to her. The only place for a scientist in criminal investigation was forensics and however much she tried to explain the difference between physics and forensic anthropology Ron and Harry never seemed to get it. They probably just chose not to, neither of them were stupid. They just directed their intelligence elsewhere.