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It takes around two to six weeks to show effects (drugs from SSRI group) and depending upon the response, the drug may need to be continued for two years or so.
It is not true that she will need to take it lifelong. It all depends upon the response and individual preference and side effects.
And last but not the least, if you have improved a lot and need a drug to maintain the improvement, then what is wrong in taking it? Overall, they improve the quality of life.
So do not worry excessively and unnecessarily.
For more information consult a psychiatrist online --> https://www.icliniq.com/ask-a-doctor-online/psychiatrist