In one of the writing books I've read it talked about a writer who, whenever things were dragging or getting boring, he would send in a man with a gun. Metaphorically or literally, both work. I really like this idea and it's helped me get through important but perhaps boring scenes, and create a more overall exciting story.
This idea has helped me as I'm writing my way through my novel. Just think, how can things get worse? Who is the last person she would want to see right now? And then make that worst thing happen or bring that undesired person in.
'Man with a Gun' could be something like a haunting dream, a letter from a relative, someone in the hospital, something found in Grandma's attic, a natural disaster warning, an unexpected pregnancy, anything that can jolt your characters into passionate action. A plain old man with a gun works too.
I'd love to hear your ideas about keeping things going and going interestingly. I hope this helps, and best of luck in all your writing!