You see her standing there as if awaiting your arrival seemingly unimpressed that you plan to mask your true identity to her. To lie to her means she will decide your fate with a battle that is using her Mother's ancestral vessel to take you down...or even turn herself into a giant formidable spider...but she reserves that only for dire circumstances

The Second Sister : "Why have you come here? I can't read your mind but I can decide your fate."

She seems to be protecting something. You don't know what yet but whatever it is she doesn't seem to want you near it unless you're proven worthy to face it.