Final answer:
Based on her symptoms, Cindy most likely has cystitis, which is a bladder infection caused by bacteria, indicated by her dysuria, hematuria, and the absence of fever.
Step-by-step explanation:
Based on the symptoms of frequent urination associated with a burning sensation and blood in the urine, along with no fever, Cindy's most probable diagnosis is cystitis. This is typically caused by a bacterial infection of the bladder. Key symptoms of cystitis include dysuria, which involves urination accompanied by burning or pain, pyuria, where pus is found in the urine, hematuria, which indicates blood present in the urine, and bladder pain. Since Cindy does not exhibit systemic symptoms such as high fever, which are generally associated with pyelonephritis (a kidney infection that could develop from an untreated bladder infection), cystitis is the most likely condition.