Hi Hun, I take Venlafaxine, when I first took it, it did make me tired and lethargic, also have a dry mouth, but those symptoms lessened after about 3 or 4 weeks,
when I had an increase in my dosage they did come back again for a couple of weeks then lessened again.
But please remember that everyone is different and everyone will react differently to medication, so your daughter may not get the same side effects that I did etc.
The side effects should lessen over a few weeks aswell, but if the side effects are to much for your daughter then she needs to go back to see her dr x