That is what I am saying. It is a deliberate move by CVs to show Shaurya as Anokhi's saviour. Otherwise Astha could have handled it on her own. But this is Shaurya aur Anokhi ki kahani and the CVs give most of their attention to Shaurya and a little bit to Anokhi. No one would care if there is some inconsistencies in the side characters so they are butchered as needed.
Still for argument's sake, I would say that Aastha did try to convince Anokhi to fight to prove herself but the scene was cut abruptly so we don't know if she pushed her any further. Her reaction was not bland. And Aastha is not scared of Sabharwals, else she would not have dared to step inside SIAC after 25 years and threatened to report them to the education board. I think she stayed away this time because she knows the Sabharwals are against Anokhi mainly because she was Aastha's recommendation and her involvement could have made matters worse for Anokhi. Also she was not aware of the rustication bit. She only thought Anokhi was accused of cheating. No one gets rusticated for cheating in an internal exam.