I will say what I said on another site... Keket wants her trunk cared for.
You know... when I first read this chapter, I was quite surprised that Keket's ability is poison... especially that she uses it with such finesse.
I presume she can transmute the "poison" into different "forms", but even then... to transmute it into the right substance, then combine with the correct amounts is not an easy thing.
I do think that she, being from the demon race, has much more resistance, and some poisons and toxins may work differently in her body, but she has some impressive control over her power.