Proceeds from stock sale

Hi all - I sold some stock from an account that is in my name, but *belongs* to my sister and me (proceeds from our mother's estate).  The funds went to my sister, and I was told I could transfer the tax liability to her. I see a way to transfer interest or dividends, but not how to show the income as hers rather than mine.

 

Help? Thanks so much,

Deborah in San Diego