You yourself have mentioned she has commited bigamy in your previous posts,that itself shows you do not accept legality of such a divorce deed.So both 496 & 497 will apply.
Now you yourself have not mentioned important points here.
497. Adultery.--Whoever has s*xual intercourse with a person who
is and whom he knows or has reason to believe to be the wife of
another man, without the consent or connivance of that man, such
s*xual intercourse not amounting to the offence of rape, is guilty of
the offence of adultery, and shall be punished with imprisonment of
either descripttion for a term which may extend to five years, or with
fine, or with both. In such case the wife shall not be punishable as
496. Marriage ceremony fraudulently gone through without lawful
marriage.--Whoever, dishonestly or with a fraudulent intention, goes
through the ceremony of being married, knowing that he is not thereby
lawfully married, shall be punished with imprisonment of either
descripttion for a term which may extend to seven years, and shall also
be liable to fine.