Retirement tax questions

@NCperson   I think I'm in the same situation.  Why can't she as a spouse roll it over to her own IRA?  I haven't moved my husband's 401K, but I'm thinking about it.  My husband died in 2023 and was taking RMD.  They moved it to a spousal 401K under my name.   Even though I don't turn 73 until next year 2026,  I had to keep taking the 401K RMD based on my Single Life.  Other posts I read say you can roll it into my own IRA (not just Inherited IRA).   Why does it need to be a separate IRA?