As we all know Misha is scheming, she has some sort of plan against Sid family...so of you said maybe her family left because of something that happened with Sid family hence making them leave all of the sudden...that means she is on the path of revenge...how low will she stoop to get it as we all saw she ousted Simran and Kritika scheme, she helped Roshni name get cleared, she help Sid win back Roshni and now she has helped Roshni with discovering the truth about divorce
That all means that now everyone will see Misha as a good person who can do no wrong, this is when she will strike and we don't know what she is capable of...all we do know is she will be a very smart villain which will be fun to watch