Evaluation of such an injury by a "school trainer" is beyond and above her pay grade. Prosionally one must rule out a torn miniscus, which is usually established by radiological examination and inserting a trochar to extract fluid and exami ing it for blood. As this took place on school grounds the school eats the medical bills. A turn miniscus may represent surgery and a lifetime problem so sppropriate medical documention is necessary. This cannot be provided by a "school trainer". An ER visit as soon as possible is in order where a differential diagnosis can quickly be made. The needle insertion is relatively painless, but the needle looks large and intimidatimg. Look the other way. Rest and a brace may be in order as well as refraining from firther athletic activities. In terms of ther miniscus a decision must be made as to whether there is a partial tear or a full tear in the tissue. The MRI is usually used for this purpose. You must begin proper medical documention of this injury immediately (and, as I stated, the school eats the bill). Often such injuries respond to partial immobilization and rest, but not always. There is a window of opportunity for treatment, which is why a professional evaluation is required ASAP.
Will do thank you so much.