Ready to strangle my Muse..

This is so frustrating and not sure what I should do... I'm so close to wrapping up Robbie's Revelation (The 1st book at least), I have 3 maybe 4 chapters left to where I want to end the Revelation part at.. Now my time is already limited severely for writing, so what's my muse decide to do?!? She starts throwing a completely new story around in my head and it's distracting me from finishing Revelation...

Trying to get her to focus on the story I want to write right now would be harder than herding cats..

Not sure what to do but start writing some of the 'new' one just to get it out of the way and get the heifer to refocus...

At my wits end..
Rebecca Jane..