Maybe you should re-read the first post before getting all hot and bothered. She is already here, waited 10 days before starting to do anything about the FACT that she only gets 14 days on arrival here. Be honest, it is shockingly naive to have not checked something like visas when booking her flights, particularly since people of your nationality do tend to have stricter rules to adhere to in many countries.
No, it's not illegal to do what you said but again, in the circumstances, it is ill-advised. If you have managed to exit and enter freely on a number of occasions then lucky you - you are definitely in the minority though.
ALSO - since you are "working in aviation" you obviously have a working visa then which is a totally different case. Otherwise implies that you are, in fact, living here illegally.