Wow, your situation sound pretty much like mine dude.
I think you have taken some very appropriate measures to collect the evidences, which will be useful going forward. Few points I'd like to add as I myself went through this:
[+] You said you take snapshot of WhatsApp - thats nor very effective, email the entire chat to yourself every few months. Ans dont loose the original phone you use for whatsapp.
[+] If you are using smartphone, always use the call recorder app, you can delete un-useful call records every few days. Don't disable it. You dont know which call will become useful.
[+] Collect evience of her working, insteand of confronting directly. Is she highly qualified ? Prior work experience ? You should have collected the evidence of her working instead of confronting.
[+] It seems to me that you are at the final stage of breakup. Act nice to her and other well-wishers, you should not reveal that you are thinking of taking legal step. Record eveything if you are not already doing so. Try to get them talking about things you can use in your favor. Can you buy a recorder when you go to meet her ? Last few days conversation would carry much weight as evidence.
I am no alwyer so can't give legal advice, but from what I learn, malicious wives mostly take the same path - DV and 498A. Maybe take anticipatory bail, for your parents. You said, you live in different city from your parents, how many days your wife stayed with your parents ? If there is no domestic relationship, implicating your parents in DV/498A will become weak on her part though. On your part I think you can file cruelty, but it will be hard to prove.
It is very easy to level allegations, and our legal system has give such an easy option to women of bringing harm to the husbands that hardly anyone can resist the temptation, and think that that the husband will be scared and come down to negotation table. But you should choose to fight on merits of the case. No false allegations are strong enough to sustain for long. So it is always difficult on husbands part.