Your understanding of points 1-3 is solid. There appears to be no 3520 requirement (that would have been in the year inherited, anyway, but it doesn't look like there is an issue based on the value.)
You certainly appear to be below the filing threshold for Form 8938 as well.
For FBAR, it only takes a balance over $10,000 for a single day in the year to trigger that requirement to file, so you're correct there as well.
The sale of the home is reported in the investments section of TurboTax as sale of a second home unless your wife lived in it for at least 24 months. Then it is treated as the sale of a main residence as long as other qualifications are met.
You will report only your wife's share of the proceeds. For the cost ("basis"), an appraisal is of course ideal but it's not always possible (it's not even something that can be obtained in all countries).
In her case, your best effort to determine the basis will work. Don't forget to include her share of any improvements made since 2012 to the property as well. You will reduce the total basis by half for your wife's share just like the proceeds and should remember to include selling costs and the like as well as an adjustment to one number or the other.
In some cases losses on these types of sales are deductible but since your wife did live in the home for a period of time after inheriting it, her loss (if any) would not be deductible. If a loss results from the reporting of basis and proceeds, adjust the basis to get a -0- there.
Let us know if you continue to have questions, but it sounds like you're on the right path!
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