The documents are written in multiple alphabets, let alone languages, which is part of the reason she cannot understand most of them. Some notes are written in Elvish, however. The Elvish notes are brief and incomplete, seemingly relying on the other documents for context, but they make up the step-by-step instructions.
The first step is to draw the chalk circle on the floor. With some searching, she finds some chalk among the basic supplies, and the remnants on the floor provide a useful guideline. The chalk seems to smell odd when she uses it, but she can't be sure, since nobility like her has no use for chalk. Once the circle is complete, she marks it with more circles, including a star - each of its five points touching the circle - and runes she cannot decipher around the rim.
The next step is for Zeona to anoint herself. Searching the supplies, she finds a variety of oils, unguents, and what seems to be a powerful perfume. She can't identify them, but she knows some oils and paints have magical properties when applied to a person's body. Even though she doesn't know what they are, she can tell they must be too expensive for a simple commoner to acquire - especially altogether. At this point, one might almost think it convenient that her clothes were taken, as the combination of fluids would likely ruin them; one oil must be applied to her entire body, and almost all of them have to be applied to skin that would normally be covered by her clothing.
Next, Zeona must burn herbs at each point of the star within the circle. She remembers the herbs dumped out of the pot the thug handed to her, and gathers them up for use. Her first attempts to use the flint and steel are clumsy, but she finally gets one point's herbs lit and is able to transfer the flame to other herbs via some papers. The herbs throw off a surprising amount of smoke, though less smell than she'd expect, and the air soon becomes hazy. Strangely, the thugs outside don't seem to investigate this, but within seconds, Zeona finds herself light-headed and almost feverishly warm despite her nakedness.
Between and throughout these steps, Zeona must recite words she does not understand, but are helpfully written phonetically in Elvish - substituting letters from the Common alphabet when representing sounds not used in Elvish. As the ritual progresses, Zeona can feel a strange tension in the air. At first, it would be easy to dismiss it as nerves, but as the ritual progresses, it becomes unmistakable. Magical power thrums in the air, like a heartbeat.
There is one final step to the ritual; Zeona must shed a drop of blood from her lips into the circle. All weapons were removed from the building before Zeona was left alone, but she eventually finds something pointy enough to draw blood. When the scarlet droplet falls into the circle, the energy in the air redoubles, then retriples. The smoky haze intensifies until she cannot even see the walls of the room around her; she is only alone, surrounded by smoke, her head swimming and heat spreading through her body.
Then, she hears a sound - like high heels on hard stone. Zeona sees a shape coalesce in the smoke: the silhouette of a shapely human woman. The figure stands in place, but Zeona gets the impression it's watching her.
"Now, this...is interesting." The voice is sultry, seductive, and amused. Zeona vaguely sees the shape raises a hand to its chin. "For what reason do you call on me, kitten?"