What is the main conflict in The News from Paraguay by Lily Tuck?

The News from Paraguay by Lily Tuck starts when Ella Lynch, a divorcee living in Paris in 1854, meets Francisco Solano Lopez, the heir to the Paraguayan throne. Ella becomes Franco’s mistress and agrees to move to Paraguay with him where she constantly fights with his sisters. Franco wages war on both Argentina and Brazil and vows to fight to the end.