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Maxing influence with Kreia is not a problem even if you don't agree with her - she may prefer you to do nasty stuff, but she has many, many influence options over the course of the game.
And yes, there are some gains along the way, though it mostly relates to backstory and secrets she'll share with you, if you win her over, particularly with relation to her ties with Revan. I don't recall of the force-enhancing lesson she gives are tied to having a high influence with her, though. They may simply be tied to your rising power level and nothing more, but I don't remember.
How the main plot evolves does not change, however. That depends entirely on whether you choose the LS or DS way through the game (i.e., whether you kill the jedi masters or not). Kreia will act differently depending on whether you take the DS or LS option, but whether you have high or low influence with her at that point doesn't matter at all.
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