Do I need to provide financial proof for my spouse's visa application if I have enough funds in my account?

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PRINT OUT THE EMAIL THAT HAS YOUR DTV VISA.

That's what you should do... print it out.

You may have to show PROOF of your DTV Visa to airline staff on check-in for your flight ✈️ to Thailand...even to the connecting airline staff. Or to the land border crossing entry Thai Immigration Officer.

Upon arrival into Thailand, show the DTV visa to the Thai Immigration Officer and look at the STAMP placed in your passport to be sure you are STAMPED in for 180 days.

You seem a bit all over the place on this bank account on different posts across different groups. Is it a personal bank account or is it a joint bank account? If the latter the MFA and Thai immigration will view it as half the money in the account being yours and half the other account holder. Nonetheless I believe all you need is a sponsorship letter from you saying you are responsible for your wife's expenses

Some embassies accept that, and some don't.