My Daughter, Who Is 4 And A Half Years Old

My daughter, who is 4 and a half years old had a uti in march and the bacteria was the proteus mirabilis. She went on antibiotics twice and finally it left. Before that she had just been on antibiotics twice for other things. Now it's august and she's showing signs of another uti. I'm waiting to hear back results from the lab. I don't want her to do another round of antibiotics. It is too much for her. What can I give her naturally and safely? I've been upping her probiotics alot. Is there a safe natural antibiotic she can take?
thanks,
Carla