If they have been filing as a partnership, then I believe the answer is no.
On the other hand, if they had been filing 1120-S and had "reasonable cause" for failure to file a timely election then they should be good.
Your research should turn up a rev. proc. with details.
I think what Danrvan is asking is. 'Since January 1st 2022 have their legal, accounting and payroll activities been handled as a Partnership or as an S Corporation?"
Temporary Relief provided to taxpayers born in 1951, to RMD requirements for beneficiaries and RMD/Rollover confusion.
https://www.com.currentfederaltaxdevelopments.com/blog/2023/7/14/irs-defers-proposed-regulation-rmd-requirements-by-at-least-one-year-provides-temporary-rollover-relief-to-those-born-in-1951
Secure 2.0 definitely needs a CPE class of it's own!
It sounds like the account went dormant and has been transferred to the lost property division of the state. I think that she would need to make a claim through them rather than through the bank. The procedure for that might vary from state to state, and it will probably be complicated by the fact that she doesn't personally have any title to those funds. But it should be doable. I would google unclaimed property + the state the funds were held in.