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I am sorry to hear about Ella's problems. I am a veterinarian and will do my best to help.
How was she treated for the onion toxicity? If you check her gums, are they pink in color or do they look pale?
Can you tell me the active ingredient in the ant spray, or the brand name? Some are more toxic than others but most ant sprays are fairly safe. Knowing the active ingredient will tell me what symptoms to expect if she did get some.
Blood in the urine can be a sign of a bladder infection, but can also be a sign of "hemolysis" (red blood cells breaking up inside the blood vessels) which is seen with onion toxicity.
Since she got the onions a week ago, it seems unlikely this is from the onions, unless she got into more onions. If her gums look pale, or anything less than bright pink, I would be worried about her. Let me know how her gums look, and what treatment for the onions was done.
How is Ella doing? I hope you were able to see what I wrote.
I have not heard back from you. Was this helpful? Can you let me know how she is doing?