She may learn to please, to manipulate, to compete, or to control, but she is unable to learn to be fully present in the world as her genuine self.
She doesn't learn that she has meaning and value. She doesn't learn that she can put that meaning and value within her to work to accomplish goals.
For example, if she breaks something, whether it is a lamp, a car, her word, or someone's heart, it is possible and healthier to give her the responsibility for making necessary repairs using her own resources and her own creativity. In such a process, she learns what effort means. She learns what responsibility and consequences for actions mean. She learns reasonable limits and reasonable expectations. She develops resources to make healthy and caring decisions in the future.
Without such lessons, she learns are the tricks involved in adapting quickly to the expectations of others or being manipulative to get what she wants. These are poor and insubstantial tools to rely on when building an adult life.
Somewhere inside, over time, she may gradually realize this. But without a sense of boundaries, she will only become bewildered and anxious. She will accelerate her practice of using her eating disorder as a way to numb her feelings of anxiety. She will use her manipulating skills to get what she wants from whomever she can exploit.
As time passes, fewer people in her life will allow themselves to be manipulated. The quality of her circle of associates will decline as she seeks people she can control with her inadequate methods of functioning in the world. She will find herself in bad company.
This becomes all the more reason to rely on eating disorder behaviors for comfort. The people around her are less reliable all the time. And finally, they tolerate her presence only because they can manipulate her.
She arrives at the total-victim position. Her manipulative skills backfire. People exist in this world who are better at manipulating and using than she. She has found them. She becomes their target and then their prey. Her dependence upon her eating disorder becomes her most valuable and trustworthy relationship.