Machado is young, fit and now has this prize that will last forever and will 'stand for all time' according to the OP.
Why would she genuflect to Trump to get in on the Venezuela transition government?
I think winning the first proper election is also far better optics than being installed by Trump.
I also think the Nobel comittee sealed Maduro's destiny with their choice back in November. All of a sudden Venezuela was on Trump's radar because it was signaled as 'the thing' to solve in order to receive the Nobel.