Even better. If Bhavani is jailed and Amruta is outside, she can easily arrange for lawyers and get her bailed. Honestly, the Ahujas do not have any proof against Bhavani. And throughout the show they keep telling how efficient Mumbai police is. So, Amruta should have taken that risk and put her faith in the judiciary.
I mean fighting for your mom is much easier and sensible than being married to a psychopathic momma's boy, imo!
You have a valid point. Amruta is an intelligent girl. She will have collected enough evidence to prove her mother innocent. But, may be, at that point she was tensed and didn't think anything.
Wow, impressive ABC Madam! Wah!

... Saas Bahu.... and then forget about what happened in these eps...