"Missed diagnosis"

We have attended a+e with my daughter on 3 different occasions over the course of the last week. She has several respiratory conditions, all 3 times we were told it was a virus and we didn't need to be in hospital. On Tuesday she got very poorly I took her to my GP out of frustration that the children's hospital weren't taking me seriously, they looked at my child and immediately referred me back to the children's on arrival her temp was 39.8 but we were told there was not one bed in the trust. Waited for four hours for a bed on CDU where she was diagnosed with septic tonisilitis not one previous doctor had looked in her throat, Isn't this a basic requirement of an examination?? Because the infection was allowed to take over her body she required IV anti biotics and NG feeding all of which was very traumatic for her. Again on discharge I feel it was rushed because they needed her bed, when at home she is still now unwell. I feel very let down.