I've never heard a sentence called "felicitous". I think you mean "pleasing to the ear", and I don't think it is. 1) "rich" is not a normal modifier for "fortune".
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thfiheShe left a rich fortune when she had died.1.Is this sentence felicitous?2. If it is felicitous, what/which is the interepretation of the sentence?No. People are rich, not fortunes. Also, "had died" is not necessary in an isolated sentence like this. This is all you need: