To be serious for a moment, the REAL reason she abhored the crosses is her "sin nature" (to use a term I really don't like, but can't think of another one) hates God.
It's why so many professed "secularlist" who, logically, shouldn't care about Christians, really hate Christians and try to tear them down.
While vampires are fictional demons, she is very real, and the principle of evil being repeled by the Light of God is a very real phenomina.
I have no doubt the crosses enraged her -- or something within her.
I agree. Nearly all people I've met who claim to be secularist, humanists, atheists or agnostics in fact despise Judeo-Christian culture.