Thank you for all the input.
In swimming more calorie consumption occurs.
As she is having allergy
to many foods, there can be less calorie intake according to her need, so she is not gaining weight properly.
In anemia, there can be less weight gain, tiredness
, shortness of breath.
She has improved, with further increase in hemoglobin, ferritin her symptoms will disappear.
You can make an appointment with a dietitian to check whether her calorie intake is appropriate.
She can also have an evaluation for he heart.
You need to discuss it with her doctor.
Doctor can advise ECG.
If it is required, then echocardiography can be taken to assess the heart status.
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Wish her healthy life.