As someone who has spent 7 years of life incarcerated, I have seen hardened criminals giving up after some time. Either Talwar couple is hard than hardened criminals or they are really innocent. I am pretty inclined to go with the latter. 

 Being the best dental surgeon of the country as she assumes need not nessasarily mean she is a law abiding citizen , certainly the talwar family is hiding a lot.If they are not directly involved in the crime ,they  would have  hired a proffesional killer and certainly some higher ups in the administration is covering up the matter for the Talwars.

Why was she hiding...why was she so afraid of being questioned??????????????

Aarushi Case: CBI Not to Arrest Nupur Talwar for Now
PTI | New Delhi | Apr 13, 2012
 

Justice deferred by the SC does not mean justice denied. Aarushi's parents continue to remain the accused till proved otherwise.

A K SAXENA, DELHI

 As someone who has spent 7 years of life incarcerated, I have seen hardened criminals giving up after some time. Either Talwar couple is hard than hardened criminals or they are really innocent. I am pretty inclined to go with the latter. 

Aarushi Case: CBI Not to Arrest Nupur Talwar for Now
PTI | New Delhi | Apr 13, 2012
 

Justice deferred by the SC does not mean justice denied. Aarushi's parents continue to remain the accused till proved otherwise.

A K SAXENA, DELHI