Turning off iMessage on her iPhone, making sure any references to iMessage in any device settings (including OSX) related only to an email address not a cell nu

Turning off iMessage on her iPhone, making sure any references to iMessage in any device settings (including OSX) related only to an email address not a cell number before moving to Android meant my girlfriend didn't experience any issues. Not sure if that's a panacea and she was just lucky though ..