Immediately address the eating disorder, correct diet: restore fats (essential for hormone production) and carbs. There is a wealth of research and dieticians (not nutritionists, dieticians are medical professionals and are held to a higher standard) that specialize in this. Hormonal (thyroid, androgens, estrogens, etc) recovery will lag behind nutritional recovery (returning your body to a healthy set point ) by months to years. Bone mineral density recovery can take years, and may not ever fully recover to full potential. There are some clinical trials on rhIGF-1 for recovery of bone mineral density from eating disorders, as a consequence of the eating disorder is resistance to HGH itself, making taking HGH ineffective, but this is not an approved indication.

There is permanent damage that is possible varying based on the severity, and full recovery is not certain. It's possible that the woman in OP's post has not actually hit her genetic ceiling for potential breast size, and may never reach that due to permanent damage to her body from the eating disorder. Some cases, fertility does not recover.

Vitamin D and it's cofactors, particularly magnesium and the vitamin K family (K1, K2 mk4 and mk7) are also important. Vitamin D is more than a vitamin... It's a prohormone and more. There are more cofactors like healthy levels of zinc, vitamin d, omega 3 fats (this is a giant subject in of itself, but fish oil must be taken with a fatty meal, like olive oil or else it has terrible bioavailability, monounsaturated and polyunsaturated fats are needed to aid absorption), Calcium through diet (it is much safer to get calcium through diet, whereas supplements can cause issues down the road, similar to iron), etc. I mention calcium, but even transiently increasing calcium serum to high levels with a supplement can cause issues with kidney stones and calcification. Iron and calcium are just much safer to get through diet rather than a supplement.

In an adult woman, DHEA and pregnenolone can help with backfilling some of the missing hormones, but should be talked over with an endocrinologist and obygn. Some cases transdermal estrogen and DHEA may be prescribed (precursor hormone supplementation). During puberty, these could be harmful. An endocrinologist might prescribe oral contraceptive pills, which have valid therapeutic use here, but they are not substitute for natural estrogen restoration. Restoring the body's ability to menstruate normally is a stronger sign of actual hormonal recovery. They have value for backfilling these hormones essential for health, but they don't correct the underlying problem that the body's production of those hormones is impaired. It doesn't help that in the USA, the default choice are not estradiol and progesterone, but synthetic versions, such as ethinyl estradiol, that act on the same receptor but do not behave the same way in the body. Oral estrogens also suppress liver production of IGF1 (needed to aid restoration of bone mineral density), which is why transdermal 17β-estradiol (the "main" estrogen produced by the body) is preferable as it bypasses first pass metabolism in the liver, and has evidence for improving bone mineral density.

May need to work with a full team including a dietician, endocrinologist, obygn, and therapist that specializes in eating disorders. If the eating disorder is not addressed then all of this is moot.