"What if the does have a HDHP plan coverage of her own, through a state marketplace and is covered by her spouses HSA?" - I do not understand this sentence; it appears to be missing at least one word.
"How do we deduct the contributions we made to the HSA?" Does your spouse have an HSA? You, of course, cannot contribute to your HSA now that you are on Medicare.
It is possible for the self-employed to contribute to an HSA, by making HSA contributions directly to the HSA custodian.
This is entered on the screen in the HSA interview with the heading "Let's enter [name]'s HSA contributions" on the second line where it talks about "personal" contributions.
This amount is deducted from gross income on line 12 of Schedule 1 (1040).
"And can we deduct her premiums?" - what premiums are you talking about, your spouse's health insurance premiums?
How you enter your self-employed health insurance premiums depends on whether your health insurance is COBRA, ACA (Obamacare), or regular health insurance.
Please see this TurboTax Help screen.
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