You are within your rights to request to wait for a VCUG until she has had another UTI. It seems that there may be some special circumstances here that could have led to this one. However, if there is another one (her doctor should do a follow-up culture to make sure this UTI clears), it would definitely be best to have it done to make sure there aren't structural problems.
Meanwhile, to help decrease the possibilities of another UTI, help her learn to wipe front to back and don't allow bubble baths.
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