While it’s possibly she may be a neurosurgeon or nuclear scientist, the money she is making is too good not to come back. She has to be clearing thousands in cash a week, that’s hard to turn away from.
I agree, she's undoubtedly done quite well for herself in this line of work, and it must be tough for any of these girls to walk away from that kind of income. But one never knows what circumstances are cause for a change of path. Life has its ways. Family, health, personal goals... could be anything.
Perhaps she was smart and invested her money wisely, and she can retire comfortably in her native land. Or someone swept her off her feet and they rode into the sunset. Who knows? I do have a glimmer of hope that she'll return, as this isn't the first time she's disappeared. Selfishly, I hope Arie will again grace us with her presence, but ultimately I hope she's happy and healthy. Best of luck, dear Arie!