First, I would schedule a conference with her teacher. It is near the end of the school year, and the teacher will have had a chance to observe her reading and probably to administer some sort of standardized test. These tests, though criticized by some, can provide much valuable information if properly used. She would also know the resources available in your area for a diagnostic study of your daughter’s reading skills. If she can’t help, talk to your pediatrician.
You mention in your note that she was taught differently in the UK than here in the USA. In Britain, most educators feel strongly that formal reading instruction should not begin until a child is at least 7 years old—a milestone which your daughter has not yet reached. Make sure your daughter’s teacher knows that. Finally, read to her as often as you can; there is no better way to encourage reading in a child.
Our parenting advice is given as suggestions only. We recommend you also consult your healthcare provider, and urge you to contact them immediately if your question is urgent or about a medical condition.