How does Jane respond to the song that Mr. Rochester sang to her?

Jane is wooed, but she continues to be on the defensive.

I quailed momentarily—then I rallied. Soft scene, daring demonstration, I would not have; and I stood in peril of both: a weapon of defence must be prepared—I whetted my tongue: as he reached me, I asked with asperity, “whom he was going to marry now?”