The Humanitarian Parole Programme is temporary, I tend to think of it as a 2 year visitor visa with benefits, quite generous benefits. What the future holds I do not know.
Has she petitioned her Brother, yes F4 will take decades but that is due to the number of people applying not because it is a lottery. There was someone a few months back who got the Family Reunification Parole but that is the only one I have come across.