Girls, hi! My daughter got sick right before her birthday, she's been …

Girls, hi! My daughter got sick right before her birthday, she's been coughing for a year ? She can't clear her phlegm, she wheezes, there's no fever, there's no diarrhea or vomiting either, she just wheezes and coughs, and she's in a bad mood, weak. What do you suggest? Thanks in advance ??