Google Hangouts: Conflicting online status information

Another *"I don't quite understand what is going on in Google Hangouts"* type of question.... So - when I view Hangouts via my Android app (running under KitKat), my girlfriend's status is **ALWAYS** shown as online (green speech bubble next to her picture), **even when she is not online**. Conversely, if *at the same time* I log into my GMail account, her status is shown as **NOT online** (no green line under her name). How can she be both online and offline!!? What the hell is going on here?! Has anyone else had this issue?