But you also said "IRA" so which is it? An IRA?...A separate non-IRA brokerage account?...or are you asking about both?
IF stocks are within an IRA (or 401k, 403b etc), then there is no step-up for those, and any $$/stocks/holdings in the IRA that you do not have transferred to an inherited IRA under your control will be fully taxed, unless there were some non-deductible contributions made to her IRA in the past.
.....only stocks in a non-IRA, personal brokerage account get stepped up.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
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