Ennui: Writer Style

Okay, so I don't talk about my WIP so much, but I do want to ask a question of all the lovely writers meandering through this blog on occasion:

Do you ever tire of a character?

See, I've a highly organized WIP, which means I've been planning and strategizing and outlining (while still leaving room for creativity, I assure you) for great deal of time. When I finally started writing the novel, it poured forth. It's still pouring forth. (*Knock on wood*) Life is good; no complaints.

Except for Eliahna. She is vital to the plot. But every time I write a scene with her in it, I feel careless, bored, like I don't want to write. Every other scene writes itself. Scenes with the dear girl plod along -- I can barely make a thousand words in a sitting.

Have you ever experienced something like this? What did you do? Did you plow through or throw her out? Any suggestions?

In the meantime, I think I'm going to beat her up rather badly so that I at least feel sorry for her...