Generally it's relatively safe to combine prozac with a drug like MDMA but with 5-MeO-DALT there can be unforeseen interaction of (side)effects and you can expect effects to be blunted. Do NOT take more of the compound to compensate for getting less effect from it, you - or she - could get anxious, stressed or agressive. Also effects on blood pressure and other cardiovascular functions are basically unknown. So chances are the drug will not work well, but you run the risk of getting potentially dangerous situations. Life-threatening contraindication is not suggested but considering the short history of human use of 5-MeO-DALT you might wanna not find out.
Also discontinuation of anti-depressants is never recommended. People take these drugs for a reason. Just postpone messing with the same neurochemical systems they work on until you can taper and stop with the medication.
If you must suggest her trying this, test with a much lower dose and slowly build that dose up. Not the same day or night but at multiple occasions. You do not want to find out she reacts badly to this on a moderate to full dose, do you?
Be patient, it's not worth it wanting to get her to the same level you are on just because of aphrodisiac effects. I'd convince her to stick to other things she is accustomed to that work okay with prozac, be that cannabis or something else. And perhaps on other occasions unrelated to this check if something strange happens when she does 5-MeO-DALT.
All this ^ is if you really must. But better is to not.
