Lyric discussion by Kiyoko 

Cover art for Silverflame lyrics by Dizzy Mizz Lizzy

i believe what killercliche said is more correct.

The "Silverflame" is most likely meant to "burn" her last words "say my name" which most likely is his/hers name, in her soul "take control, of my heart, of my mind and of my soul."

who knows, i do however find it unlikely that HE refers to her as silverflame.