Conversation so far:
What's one of Rihanna's business endeavours?
Rihanna's first fragrance, Reb'l Fleur, was released in January 2011.
How did the fragrance Reb'l Fleur by Rihanna sell?
The product became highly successful, according to Rolling Stone, Reb'l Fleur was a financial success and was expected to gross US$80 million at retail by the end of 2011.

Question: how did she get into selling fragrances?
Self-contained rewrite: How did Rihanna get into selling fragrances?