Lets not. She is not hard rock or anything, but she is considered the Queen of Russian rock n roll.
If you really want to compare her to Pink, then only Try This is applicable.
Pink doesn't have such guitar rift driven songs like Hochesh or PMML
Not to mention that Zemfira IS a band and headlined numerous rock festivals.
I think calling Zemfira Rock'n"Roll is a stretch. Maybe she is called the queen of Russian Rock'n'Roll for the lack of any other artist to fill that title.
Her songs are very catchy, but pretty standard pop. What differentiates her and makes her outstanding is her lyrics and often dark/melancholy/mysterious subject matter of her songs (like Spid, Hochesh, Beskonechnost, Progulka). She generally follows a pretty standard pop song outline found in many Western contemporaries: mellow verses - explosive chorus.