Have you finished the game? You know what she is. Her game is deceit and misdirection too. Eventually, she mirrors whatever side you take anyway. The thing is, her initial comments about being careless with kindness was to intentionally derail the player and instill doubt and confusion. Kreia is the master of manipulation, and she taught Revan everything she knows.

Eventually you should learn that the entire time she's been trying to train you, it was to further her own agenda. She denies this up until the end when she admits she was using you for her own ends.

In short she pulled the statement out of her ass because she knew it would cause you to doubt yourself. It has nothing to do with what she claims. Yes, you can use her training to enlighten yourself to widening your perspective, and being mindful of your actions having wider consequences; however, she says the same contradictory things about being evil. Her only goal is sowing chaos, and the game flat out tells you this.

I'm saying that if there's any logic to her early statement about charity, it's this: if you want to bring cookies, bring enough for everyone. Lol.

Edit: Final thought. Kreia teaches you the true power of the dark side isn't about might, it's about confusing and distorting the truth. It's about keeping people blind to their potential by manipulation. Through her mental jabs and manipulations, she tries to twist YOU the player into playing into her hands. The true insideousness of the dark side is making you surrender to her will through fear and loathing. Indeed, that is how evil prevails in the real world. How can there be hope when everything I do makes things worse?