First of all Jaheira cannot memorize the Identify spell. It is a mage spell and she is a druid. Second, is Aerie wearing armor. If she is she cannot use her mage spells. Third, have you rested since assigning spell slots for identify. You have to rest to actually memorize the spells. Check the mage book and if the spell is "gray" then it hasn't been memorized.
Give the identify scrolls to Aerie and she will be able to use them.
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It is better to keep your mouth shut and appear ignorant,
than open it and remove all doubt!