I agree with Mr. Q Slinger.
If wife wishes to withdraw 498A then also she cannot since it is non-compoundable. Moreover she may be charged U/S 211 IPC for giving false charge.
Please note, withdrawing FIR for non-compoundable offence is also an offence and punishable for impressment.
I request all friends that please don’t go for any shot-cut way for coming out from 498A. Please go for speedy trial and get acquittal.
Please read each of my posts carefully in the following links for sample petitions and other necessary clues.
https://www.lawyersclubindia.com/forum/Fight-against-misuse-of-498a-ipc--103100.asp#.U6gslUCm9dg
https://www.lawyersclubindia.com/forum/Best-way-to-fight-against-false-498a-103111.asp#.U6gsRkCm9dg
https://www.lawyersclubindia.com/forum/details.asp?mod_id=104564&offset=1
https://www.lawyersclubindia.com/forum/Why-speedy-trial-amp-perjury--124819.asp#.VbzWibOqqkp
https://www.lawyersclubindia.com/forum/Why-speedy-trial-and-perjury--124820.asp#.VbzWx7Oqqko