The base has rocket legs. I assume that means it's mobile enough to serve as an 'escape pod' of sorts - that she'd be escaping on it....though, Commander-san did make it sound like she'd be leaving the base behind...

[Hmm.]

I don't think we can say either way if Halley-san is going through with it. You can care deeply about someone and still put a knife in their heart. I have.