Sevarics said:
Who would inherit the French territories?
Louis VII and Eleanor had two daughters OTL. The eldest of these daughters, Marie, was born in April 1145. Eleanor dying on crusade would thus not prevent the birth of the little Princess Marie.
Marie would most likely be Eleanor's heiress in this scenario. That said, the young French princess would be extremly young (2 or 3 years old), so there is room for contestation/opposition.
Janprimus said:
Eleanor's younger sister Petronilla/Alix was married to count Raoul I of Vermandois (Capetian house of Vermandois), so they will have the best claim to the duchy.
They could make a bid for the Duchy but that depends on their relationship with Louis VII. Raould of Vermandois being a Capetian, he might not have much trouble having the daughter of his cousin the King of France becoming Duchess of Aquitaine.