Hello. Welcome to HCM. I am Dr Jigar( ID specialist). I understand your concern. As its not just matter of pneumonia, your mother is facing stress of post transplantation. She must be under immunosuppressive drugs continuously so that transplanted organ remain in situ. Due to these drugs she is at high risk to develop various infections. In my advice respiratory secretions needs to be sent for culture and sensitivity both for bacteria and fungus. Also viral etiology should ne ruled out according to clinical picture. You should not hurry in this situation until diagnosis and proper treatment is done which i think should take minimum 3 weeks. I hope this will help you. Feel free for further help. Regards.