Curious

As usual, when she was bored she'd go around to search for something interesting, passing through room by room, she was coming at the outside of a "Breathing Room". What caused she felt curious?

She saw a little boy with her mum and a doctor. The little boy smelled the gas since he had asthma, her mum looked worried. Somehow, she felt pity on him. Perhaps, it was due to she had asthma too, but her situation wasn't as worst as him. A worried face was shown on her mum's face; this was what she couldn't forget.

She hoped to know who the boy is. By the way, a sense told her, she'll meet him someday. She left.