Many members have taken the stance recently that Eve knew what she was doing when she partook of the forbidden fruit - that her action was noble and enlightened. However, the idea that Eve acted knowing that she was furthering God's plan and doing the right thing isn’t supported in either the text or the temple.
I believe this for three reasons:
1) Her own words state that she was beguiled. ("The serpent beguiled me, and I did eat." - Genesis 3:13) "Beguiled" means "tricked, misled, deluded" - NOT knowledgeable and insightful. She says she was tricked; I believe her - at least, I would if I took the story literally.
2) 2 Nephi 2:18 makes a direct connection from Lucifer's status as "the father of all lies" and what he said to Eve. Thus, his statement to Eve was a lie - and she bought it, acting as she did because she believed a lie.
3) It appears to me that Adam and Eve were kicked out of the Garden less for partaking of the fruit than for doing so at the behest of Lucifer. In other words, they were punished for placing their trust in the devil instead of their God. God knew Lucifer would try to get them to disobey Him, so he set up a scenario that would test them. According to their own account and God's subsequent words and actions, I believe they failed the test.
In fact, I would argue that it isn't clear that Eve actually was "doing the right thing" by partaking. I agree completely that leaving the Garden of Eden ("falling from the presence of God") was a necessary part of the plan (that "Adam fell that man might be"), but there is nothing in the text or the temple that indicates Eve knew what she was doing.
I think the Fall narrative teaches the danger of trying to take shortcuts in becoming like God and introduces a reason for the struggle and temptations of mortality.
Interestingly, there is nothing to indicate whether or not God had an alternate way for them to leave the Garden of Eden if they stood firm and refused to partake of the fruit - if they could have "fallen" and still faced mortal temptation with their progeny without buying Lucifer's lie in the Garden of Eden.
Fundamentally, I don't believe this was a literal event, so that last possibility doesn't bother me at all. I believe it is allegorical and figurative, so the "you will be punished if you reject your God and follow another god" theme rings true for me - especially given the ebb and flow of the OT record. I don't read the narrative as a victory of any kind. I read it as teaching, "If you don't follow my commandments and resist temptation to take shortcuts, you will lose the blessing of my influence. I will provide a way to return, but it will be painful - and you will have to work hard for it to happen."
Frankly, I think Eve ate the fruit in the story because the story was written by men in order to explain the social, political, gender-influenced structure in which they lived. I believe it is an inspired narrative in many ways, and I believe it is an amazingly practical narrative, but I believe it is a figurative narrative just the same. I believe in a literal first man and first woman, but not in the literalness of the Biblical Fall narrative.