To be honest, neither. She stays true to her music but I don't any artist following her style or music..
Lies. There were so many female artists who tried (but failed miserably) to sound, dress, and perform like her after her solo debut... she is a trend setter.
Definitely a trendsetter.
She's never made an album or single based on what's "in."
From Crazy in Love to Single Ladies, she's definitely a staple and icon in Pop music/culture.
Many of the artists out now praise her and claim to be inspired by her.