What you could try and do, is go to a temple, save the game then kill Imoen and see if you could raise-dead her to see if that was just a one-time glitch or a permanent bug. Then you can reload.
And by the way, as far as I know Raise-dead is a cleric-only spell, so your druid won't get it. Yes the manual doesn't mention which spells are cleric's and which are druid's...
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