Both are different entities.Diaphramatic hernia requires treatment if symtomatic other one does not.If your pt has most probably eventration,her dyspnoea is not due to this.Iam sure that you must have excluded other causes.

If you discarded other causes of dyspnea and you have a huge raise in the hemidiaphragm, probably due to phrenic paresis, you may perform a diaphragmatic plication and reinforce it with a prosthesis. Considering the diastasis recti it's better to perform it laparoscopically rather than thoracoscopically (the preferable way in CHRONIC diaphragmatic defects) because you can repair both in the same operation.

I highly encourage you to perform a CT scan of your patient in order to correctly diagnose diaphragmatic hernia.