Board Thread:Theories and Speculation/@comment-33485854-20180625233306/@comment-1512913-20180627002940

The databook literally says that she had a Byakugan and upon eating the chakra fruit awakened the Rinne Sharingan as well.

The reason Obito retained some of his powers is because he had been a jinchuuriki and jinchuuriki retain some of the Biju's chakra even if the Biju gets extracted.