You need to use both Schedule D and Form 1116. Report the sale of the property on Schedule D. When you enter the date acquired and the date sold, TurboTax will know it is a long term capital gain. Your cost is your mother's cost basis on the date of the gift plus closing costs and any improvements you made. To get credit for the foreign tax paid you will have to fill out Form 1116.
Here is a link to help you find where to enter your information into Form 1116:
https://ttlc.intuit.com/replies/3302405
Here is a link to help you find where to enter the sale of the property:
https://ttlc.intuit.com/replies/6028033
