Alice was never in danger in NOES4 or NOES5
In both cases, if Freddy killed Alice, he'd also kill himself.
Remember, before Freddy's Dead, the criteria for who Freddy can attack is either A.) They must be the child of those who killed him or B.) He must already be in that person's dreams due to odd circumstances, such as being brought in by a Kristen, Alice, or Jacob. In NOES4, no one else fits the bill but Alice. So the second she dies, Freddy would die too...
In NOES5, we learn that a baby dreams with its mother while in the womb. We also learn that Jacob has inherited his mother's powers AND is being force-fed Freddy's. So, Freddy plot is the use Jacob like he did Alice in NOES4. In this case, Alice is still invincible as Freddy can't actually kill her without killing Jacob in the process. Killing Alice before Jacob is born would result in an instant miscarriage, this leaving Freddy a sitting duck once more.
So, as much as I love Alice, it kinda lowers the stakes for her. Yes, everyone she knows and loves can be taken from her but she herself cannot be killed by Freddy as it would be foolish on his part. She's his only connection to the world until Freddy's Dead.