But should they once yield to temptation, their nature would become so depraved that in themselves they would have no power and no disposition to resist Satan. {PP 53.2}

But they were told that their nature had become depraved by sin; they had lessened their strength to resist evil and had opened the way for Satan to gain more ready access to them. In their innocence they had yielded to temptation; and now, in a state of conscious guilt, they would have less power to maintain their integrity. {PP 61.4}

When man transgressed the divine law, his nature became evil, and he was in harmony, and not at variance, with Satan. There exists naturally no enmity between sinful man and the originator of sin. Both became evil through apostasy. {GC 505.2}

In the creation God had made her the equal of Adam. Had they remained obedient to God--in harmony with His great law of love--they would ever have been in harmony with each other; but sin had brought discord, and now their union could be maintained and harmony preserved only by submission on the part of the one or the other. {PP 58.3}

Gen. 2:20 And Adam gave names to all the cattle, and to the birds of the air, and to every animal of the field. But there was not found a suitable helper for Adam.

So, Adam and Eve didn’t know the consequences of their choice, of their rebellion.
This means they didn’t understand God’s warning that if they ate the forbidden fruit, they would die. God didn’t give them any clue of what “dead” is, and allow them to find it out them selves with the risk and consequences revealed only after they transgress his command.

The angels warned them to be on their guard against the devices of Satan, for his efforts to ensnare them would be unwearied. While they were obedient to God the evil one could not harm them; for, if need be, every angel in heaven would be sent to their help. If they steadfastly repelled his first insinuations, they would be as secure as the heavenly messengers. But should they once yield to temptation, their nature would become so depraved that in themselves they would have no power and no disposition to resist Satan. {PP 53.2}

Holy angels often visited the garden, and gave instruction to Adam and Eve concerning their employment and also taught them concerning the rebellion and fall of Satan. The angels warned them of Satan and cautioned them not to separate from each other in their employment, for they might be brought in contact with this fallen foe. The angels also enjoined upon them to follow closely the directions God had given them, for in perfect obedience only were they safe. Then this fallen foe could have no power over them. {EW 147.1}

Why did she place herself at the only place where the devil could communicate with her?

Why do we end up in where we can also be tempted?