Welcome to Justanswer! I am Dr. Altman and happy to assist you both today!
I am sorry to hear Satara has been spotting for so long at her age!
My first inclination is to do a urinalysis on her because the spotting might be related to a surge of hormones but she also might have a urinary tract infection. Even though the bleeding is not related to her urination it is something that should be ruled out and an easy fix if this is related to a vaginitis or bladder infection.
I would try increasing her water intake at this point. You can do this by supplementing the dry food with water and flavoring the water (maple syrup or salt free broth for example) as well. Increasing the water intake will help "flush" out the bladder.
Collecting a first morning sample in a tupperware container and refrigerating the sample if more than an hour old to have your vet evaluate the sample will help determine the cause of the blood in the urine.
I would urge your vet to run a urinalysis first and foremost but also consider doing a vaginal swab for bacteria which can be related to a hormone surge as well causing her to show symptoms of being in heat.
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