There is a recent judgement of Bombay High court in this regard:
Bombay HC:- Neither Spouse can withdraw the Consent given during filing the Mutual Consent Divorce.
The case details can be found in the case
Bombay High Court
Mr Rajesh S/O Pratap Sainani Hindu
vs
Mrs Bhavna W/O Rajesh Sainani … on 26 August, 2008
Bench: V.C. Daga
IN THE HIGH COURT OF JUDICATURE AT BOMBAY APPELLATE SIDE
WRIT PETITION NO. 3556 OF 2008.
It was decided thus:
In the above view of the matter, it is evident that withdrawal of the consent by the petitioner-husband is tainted with mala fide, baseless and unjust consideration. The judgments of the Division Benches of this Court referred in paras 14 and 15 supra are not applicable to the facts of this case. The view taken by the learned Family Court is a reasonable and possible view. No case is made out to interfere with the order under challenge.
In the result, Rule is discharged. The petition is dismissed with costs quantified in the sum of Rs. 25,000/- to be paid by the petitioner-husband to the respondent-wife.
Therefore it is apparent that she cannot withdraw her consent at a later stage. You may consult your advocate to get the details of the case referred above which if very similar to your case.