1)
Why did she say "Berach Lecha"?
1.
Malbim: It is for your benefit - you will be among your family, and [Lavan] will guard you from all evil. Also, you will find your spouse there.
2.
Ha'amek Davar: Flee alone - do not tell others! This is why she told him "Shma b'Koli" - be meticulous about my words!
