ᴀᴄᴛɪᴏɴ;
She has no way of telling that there might be something wrong with Jason, no way of knowing that he got hit in the head with an Elder Fae's light and now carries a major hate-on for all vampires -- including Jessica. Without that knowledge, she buys Eric's answer with a nod.
"My brother's okay, you're the world's oldest vampire, faeries are among us, and I'm -- well, I'm assuming I'm still just a waitress."