It's a shame if she left when she finally was getting things to work with her job. Yeah the fella is a big red flag. I wish she just went over by herself originally and gave that a try.
You could tell she wasn't happy and never settled properly in Australia. Austrailia isn't for everyone and the grass isn't always greener down under. No point staying on longer and sacrificing her happiness if she isn't enjoying life out there. There's no shame in giving things a go and if it doesn't work out coming home.