If you're not currently in pharmacy school - your questions will be general unless you do drug research in your undergrad. So....you can ask:
What kinds of things do you look for when you're at work (drug interactions, dosing errors, appropriate drug choice)?
How do you communicate with the prescriber & what makes you choose one method over another? (ex - the more urgent need may require a phone conversation, less urgent - fax via intermediaries)
Do you initiate communication or do prescribers initiate communication? How often? When does it change?
How much involvement do you have in drug education with patients or nurses who administer, resp therapists, etc...?
What parts of her job does she like & what parts would she rather not do?
If you are a pharmacy student, then you can ask a question such Z-pk suggested, otherwise, the question is inappropriate & could be misconstrued.