The first thing that she sees is that everything is very dark. The second thing is that from now on everything will always be this way.
She has never suffered from a fear of the dark, because she knows that God is her light, but that thought brings with it a discomfort. It is a flinching terror. It is nothing next to the curdling of what she would once have thought of as her soul when she sees the livid blistering of the skin beneath her crucifix. Her injuries from before, already healing, are those of a martyr. That blistering is the mark of a demon.
She will think all of this later, when the pain of physical torment overcomes the agony from within, because the third thing she sees is what happened before.
God was her light to see by. That was before. She has a new god now who loathes the light, and so she will live in the dark to please him. He is cruel, crueller still because when he meets her eyes his expression is angelic and seems to say that he has tried and will try to turn her into a good girl but he simply cannot because she is bad, bad, rotten to the core. She was always this demon. It is all her fault.
She remembers that before she would see him sometimes watching her in unexpected places: seated shaded behind a market stall as she stuttered her way through a purchase, three rows behind her in church. Once at a consolatory theatre visit, after the first two servants' bodies were found, he showed her family to their seats with a polite smile. He was always that way, a blank nobody who was somehow always near her, a genteel stranger on the street, but then she would see him watching her when there was no-one else to shield her. Then, his smile promised other things. Later, his hands will fulfil them.
God can be kind and cruel together, that has always been true. She loved God. She loves Angelus, now. She never hated her God, even now merely experiences involuntary revulsion for His instruments that once brought her such comfort and now only damage her.
She will hate Angelus, because He has turned her against goodness, against herself. She will both adore and loathe Him. She sees that now.