I would not, they are in the same class however they react on different receptors so she may experience adverse effects. Prozac stays in your system long, a week I've heard. So she should be fine until she can get a refill.
I agree with Jedwards excellent answer except I might go a step further and suggest it's a really bad idea. Years ago I had a Doctor who had me do a switch with similar meds due to intolerable side effects and it sent me bonkers (more).
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