After a series of strange events, a young woman concludes that she is a witch with magical powers. Against her will , her family pushes her to undergo psychiatric treatment.

I think you're right, that sounds better :D thank you

Sounds quite interesting. Maybe a "series of Supernatural events" might suffice, I know what Richiev is saying but because it is a series of events it starts to becoming a cluttered logline.

Thanks all for your comments!
According to the plots categorized by Blake Snyder, my story is genre "Superhero". Not so much, because of the whole being a witch.. Actually my intention is that during the script, you are never sure, whether she is crazy or whether she is actually a witch. It's mostly about being misunderstood and showing that we live in a narrow-minded society.
The main character is in no way passive, she has a very strong character.

What do you think of this one?

After a series of strange events that include precognitive dreams , changes in her body , and achieving knowledge inexplicably, a college student woman from a middle-class family, concludes that she is a witch. Her family becomes worried and pushes her to start a psychiatric treatment which she must fight to discover her true nature.

Doesn't really sound like a gripping story. You could do something better with the witchery aspect rather than have the young woman undergo psychiatric treatment. Perhaps she could use her powers to become a vigilante of sorts or seek revenge on those who bullied her at school and made her adolescent years miserable.

What is at stake? What would she like to achieve? What is her goal?

Agreed with many of the comments above I would add the importance of the relationship between character trajectory and genre. By this I mean consider her character flaw and how she overcomes it then consider the genre, does her inner journey relate to the genre?

This concept could be a drama or a fantasy magic story or a gothic thriller with each one the character flaw could be used to convey and enhance this. Point is I couldn't pick the genre and I think to help with this you should use a good clear character flaw description.

There have been many teenage movies about teens discovering "special" or "magical" powers. So many in fact that to write one today the concept has to be unique and in this case a unique concept means a unique inner journey.

Hope this helps.