Quinella has a sister named Qeah, who is four years younger.
I'm thinking that Quinella is trying to protect Qeah from someone or something (no, not sexual abuse--too overdone in fiction).
I'm still trying to figure out why Qeah might be in peril.
I chose "Qeah" (pronounced like "yeah") as a name because (1) It's a "Q" name (and this family seems to be obsessed with the letter Q), and (2) I was able to acquire Qeah.com for cheap, which is pretty cool.
I'm thinking that Qeah is even more geeky and internet-savvy than her older sister, which makes her having her first-name domain plausible.