Apparent satan wanted her to doubt what God said...he still uses this same tactic today, create doubt of the truth and once there it is a small step to add further to what God says....and I think he knew he had her in his trap when she added to what God said...this too happens when people follow false teachings...more and more gets added ..because the truth reveals the falsehood... so they have to keep inventing more and more and adding to their stance....until you have volumes of information to confuse and confound from the truth.
Eve was overwhelmed and deceived....on the other hand Adam deliberately took and ate fulling understanding that God told him not to eat. Sin came thru Adam...just as scripture states.
It all starts with
“Did God REALLY (actually) say....?”
It goes to show the hazard of not correctly knowing the Word of God.
Psalm 119:11 I have stored up your word in my heart, that I might not sin against you.