You need to defeat her case, deny her allegations, and ask for production proofs of paying said 27 lakhs alongwith Income Tax Returns for relevant period. Further, you can lodge complaint with IT Department, if her allegation is false for Tax Evasion and loop the Department also apart from initiating criminal proceedings against her for fling false cases.
You ought to have filed caveat before Family Court also, mere filing of caveat before Munsiff Court does not stop her from obtaining orders from other court which has jurisdiction.
You can question the Jurisdiction of the Family Court in passing ABJ order. This is the best option you have to question the order passed by Family Court.
How does a Family Court has Jurisdiction in deciding ABJ Petition when the dispute is between BIL & SIL. This, is best point for your to raise, and file petition to rejection of the same.