Validity of piece of handwritten paper as to value of stridhan in criminal/civil court

Facts of the case are such: Husband & wife settled in the USA 9th october, 2019: date of mediation of both families and return of stridhan & 15 lacs P.O in lieu of remaining articles along with a handwritten piece of paper agreeing to further pay 15 lacs in turn for no adverse cases against the boy 10th October, 2019 P.O. of 15 lacs in lieu of remaining stridhan is realized in the girl's account 21st Nov, 2019: girl files for DV in US Court (in contravention of the agreement) 22nd November, 2019 FIR u/s. 498A & 406 against mother & father in law in Mumbai December: Mediation agreement for Mutual consent is drawn up December, 2019 : ABA is filed April, 2020: Mutual consent divorce is decreed in the USA and the girl agreed for a full & final settlement of 15 lacs with further 3100 USD 6th Nov, 2020 ABA granted in favour of the in-laws The question being, the girl is demanding the recovery of further remaining 15 lacs as mentioned in the handwritten paper as remaining stridhan (the judge in the ABA order has left the question open as to whether its stridhan or not) 1.What is the scope of recovery by police during investigation? 2.What is the scope of recovery in civil court? 3.What are your suggestions