What will Lisa Murkowski do in 2016?

[NHLiberal]

Here's a question. If Miller had won in 2010, would he be looking vulnerable for 2016 right now? What Democratic challenger prospects would there be? Would Murkowski run in 2016? And if so, would she run as a Republican (primary challenge to Miller), an independent, or a Democrat? If as a Democrat, would she have joined the Democratic Party a few years before, or would she announce joining that party as soon as she announces a run?

I know all that is hypothetical/irrelevant/hard to answer but still interesting to me