a 2021 k-1 on a calendar year gets reported on your 2021 1040 return, not on the 2022 return. How did she get a k-1 from the LLC if she is not an investor? (not possible she must be or have been a member to get it). as a limited partner (actually an LLC member) and the loss being from real estate, the passive activity loss rules come into play. a portion or all might be deductible in 2021. you do not have the option of using that portion in 2022, for the loss to be partially or fully deductible she must have tax basis and be at risk for the amount of the loss.
if you have already filed 2021 and not reported the k-1 (again assuming it's on a calendar year) you need to amend it. if you haven't filed 2021 you need the desktop app and will have to mail in your return. e-filing and online prep for 2021 are permanently closed.
