WI: Carlos II's Younger Sister

According to the genealogics table displayed here, Carlos II 'the Bewitched' had a younger sister, stillborn in November 1662. Had she lived, the girl would've been third in the line of succession to the Spanish throne (fourth if you considered Maria Teresa's renunciation invalid). But what if she lived? Would she be married to the dauphin? Anne of Austria, had, after all said to her brother at the marriage of their children "truly, I hope for a son for my son sooner than I wish for a bride for my nephew [Felipe Prosper/Carlos II]". Or would she simply be married to a possible third candidate? (IDK who, but I'm open to suggestions - her niece Maria Antonia was considered as a possible match for both the dukes of Savoy and Bavaria). Let's call her Maria Luisa Miguela (after her brother-in-law and St. Michael the Archangel), what would her future be?
 
She surely would not be married to the Dauphin given she was his aunt. Sure, the Spanish Habsburgs did not seem to mind, but in France, it might be difficult to accept, especially as the Dauphin is already higher in the succession line than her (well, according to the French interpretation at least).
 
She surely would not be married to the Dauphin given she was his aunt. Sure, the Spanish Habsburgs did not seem to mind, but in France, it might be difficult to accept, especially as the Dauphin is already higher in the succession line than her (well, according to the French interpretation at least).

Okay, so what would they do with her then? Leave her unmarried or marry her to a relatively unimportant prince Spain can "domesticate"?
 
She would not marry her nephew but it's likely that she would become second wife of her uncle Leopold if her sister died young like in OTL.
 
She would not marry her nephew but it's likely that she would become second wife of her uncle Leopold if her sister died young like in OTL.
Co-sign to this. Or third, since Claudia of Tyrol would seem to be more sexually mature and Leopold is unlikely to want TWO kid wives in a row.
 
What about as a wife for her half-uncle, Karl Josef of Austria? Admittedly he's closer in age to Margarita, but if he lives, he'd be needing a wife, and if his older brother snatches Claudia as OTL, Maria Luisa Miguela might make a good match?
 
Considering the issues that the major European powers had with either the Bourbons (France) or the Habsburgs (Austria) inheriting the Spanish throne, I could see Maria Luisa Miguela as a compromise candidate after Carlos II's death.
 
Considering the issues that the major European powers had with either the Bourbons (France) or the Habsburgs (Austria) inheriting the Spanish throne, I could see Maria Luisa Miguela as a compromise candidate after Carlos II's death.

Or her children, if she ends as her full sister did, weakened by pregnancies?

What about a marriage to the duke of Savoy. When it becomes clear that Carlos II won't have heirs, they do a deal, Savoy gets Spain, France gets Savoy and the Habsburgs get Naples and Milan?
 
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