Hello, Strep infection may lead to long-term complications if not treated properly. This may affect her heart and her joints. For this reason, it is necessary performing a throat bacterial culture in order to find out the right antibiotic which can help treat the infection properly. I recommend checking for strep infection also her family members, as sometimes people are asymptomatic carriers. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Ilir Sharka, Cardiologist