In the first place whether she alleged in her DV case that you have demanded dowry from her? As per the provisions of section 3 of DPact, which is given below, dowry giving and taking is an offence.
Penalty for giving or taking dowry.-
1(1)] If any person, after the commencement of this Act, gives or takes or abets the giving or taking of dowry, he shall be punishable 2 with imprisonment for a term which shall not be less than 3 five years, and with fine which shall not be less than fifteen thousand rupees or the amount of the value of such dowry, whichever is more:]"
Now, since you have already denied to have demanded dowry or received dowry in your written statement, upon this, have you established or confirmed your stand of not receiving/demanding dowry from her parents through cross examination? if not do it, make her to commit that you have demanded and received dowry and shoot strategic questions about the evidences to establish her false statements, subsequently you may file a petition u/s 91 of Cr.P.C. before the same court requesting the court to instruct/direct her to produce the evidences for the dowry demand which have been admitted by her in her cross examination. I don't think she will be able to produce evidence, thus she will be trapped for having committed a blunder mistake, on which you can file another petition before the same court u/s 340 Cr.P.c. for perjury causing you mental agony with false statements and false cases with false allegations. Thus, in my opinion, it will be better to proceed as above instead of filing a separate case u/s 3 of DP act which may not sustain.