Khaat's visit at Azkaban had been a disaster. She was feeling sick from the potion her father had slipped her, and now she was hurting and sweating because of the broken bones in her hand. She had not said a word about her hand, and her father had not asked as they left the prison. She knew, that as a healer, he thought nothing of such matters since he found them so easy to repair. Normally, it would not have bothered her so much either. She'd had broken bones before just in her sparrings with Remus as a child. But now, without her magic, she was helpless. And she had never been so angry with her father in her life.
On the return to London, they arrived back in the Leaky, Khaat finally acted on her impulse to leave the wizarding world behind. While Robert and Brian were ordering beverages at the bar, Khaat quickly slipped out the door that led to muggle London and quickly disappeared into an alley, going quickly into a crowd of unsuspecting muggles and fitting right in. She felt fortunate that she always carried her wallet with her wizarding and muggle id's both. She was beginning to realize that the breaks in her hand were making her sick. She made a choice. She decided to go to a muggle hospital.
She walked into the emergency room of St. George's hospital It looked, at first impressions, a lot like her own. She was immediately further angered that paperwork was more important than she was, it seemed. She nearly left without being seen, but she procrastinated enough that a nurse finally came to get her and took her back to a treatment room.
She had a two hour wait in the treatment room before a doctor came in. He looked at her hand. "Broken," he told her. She sighed, frustrated. She knew that much. She didn't want to have to pay for that piece of brilliance. "Multiple fractures. We'll have to set it. Have you ever had a fracture before?" Well, she had, but it had never been treated in a muggle way. She shook her head no. He explained the process of setting and casting the fracture, leaving the cast on for 6 weeks, etc. It was just barbaric compared to what she was used to, but it was all she had right now. She was not letting her father touch her again, not even to heal the damage he'd caused. Rather, she agreed to the muggle doctor's brutal methods.
Later, much later, she was laying back in the treatment room. The injection of a numbing medication into her hand had been ridiculous, she felt. To actually put needles into something already so damaged. How sad that muggles had to live with it. The sound of the setting bones was awful in her ears, and it still hurt, despite their injected medications. And then came the application of a hard, white, fiberglass cast, letting it dry, etc. The whole thing had made her sick. They had returned her to the bed in the treatment room to let her stomach settle and had provided an additional injection of powerful medications to settle her stomach and to reduce the pain. She was not used to the pain medication at all. She had never taken a muggle medication in her life, and it snowed her. She slept off and on for a couple of hours. The hospital could not release her because the medications were so heavy. And at this point, she had nowhere to go and could not think enough to make any sort of plans. The terrible pain had stopped in her hand, and that was all she had cared about at the moment.
by 
