Upgrade Canon 6D to R6 Mk2?

Wife has a 6D and good L series prime lenses (35, 135, and 100 macro). And birthday coming up. Portraits and nature photos mostly. Was semi professional for a while and a talented photographer.

Does the upgrade to R6 MK2 make sense. Seems good(ish) value currently and a suitable model (?), but am I missing anything? Anything else I should consider?

I get a lens adapter from what I understand. Any issues there?

Is there a 'native' lens I could consider that fills a gap with the above (eg wide angle or a multi purpose zoom).

Thank you