You chose: Arabella should stay single
Throughout the novel, Arabella insists on the men around her treating her with respect and distance, repeatedly describing the deference she expects -- including that a man could only possibly earn her admiration after many years, since that is the time frame of the romances. Her interpretation of the world gives her "interpretive agency" as Wyett puts it, and "the men in The Female Quixote are obsessed with the idea that they cannot exercise authority over her until they have gained control over her interpretive agency" or imagination (Wyett 10). "Arabella's imagination can be construed as a threat to heterosexual orthodoxy," so it is fitting that if her "folly" is never removed, she would continue to be a threat and remain single (Wyett 11). While all of this means that Arabella would likely stay single if she were never "cured" of her folly, it does not necessarily mean that she would be happy or healthy being single -- she would need to be self-sustaining, which could be possible due to inherited wealth, but inheritance laws for single women may have prevented her from receiving that wealth. Additionally, her ongoing delusions could have made her susceptible to being institutionalized, particularly without a husband to potentially shield her from such a fate (although, of course, if she were married, a husband very well might be the one to institutionalize her himself). Keeping Arabella single despite the risks, though, does have an empowering angle: it "has been often observed" that Arabella's "madness...is her desire to hold authority, to figure prominently in history, and to wield power rather than surrendering it in marriage" (Motooka 252).