Joli, sorry to hear your girl's
ALT is elevated. It sounds like it's moderate from that link but I'm not sure. This other article may be helpful to you:
Canine liver enzymes-so many questions!
Does the alphabet soup of liver enzyme activities got you stumped? Dr. Jonathan Lidbury answers common questions on interpreting canine liver laboratory results and gives guidance on how to proceed with confirming a diagnosis, including when to perform a liver biopsy.
www.dvm360.com
Here's an excerpt that you may find useful:
"When taking a patient's history, be sure to ask the client specifically about exposure to hepatotoxins such as cycads (including the sago palm), blue green algae,
Amanita mushrooms, aflatoxins, heavy metals, xylitol or chlorinated compounds.
Drugs that can be hepatotoxic include ketoconazole, azathioprine,
carprofen, lomustine, acetaminophen, mitotane, phenobarbital and various antimicrobial agents.
“Asking specifically about nutraceutical and herbal remedies is important, especially in this situation, because there are quite a few herbal remedies that are known to have the potential to cause liver injury in dogs,” Dr. Lidbury says. Those include herbal teas, pennyroyal oil and comfrey.
Checking the dog's vaccination history is also important because leptospirosis and canine adenovirus-1 can cause hepatic injury.
Early in the course of liver disease, a dog may not have any or nonspecific findings or clinical signs such as vomiting, diarrhea, weight loss, polyuria/polydipsia and hyporexia. Dr. Lidbury admits that these are not very helpful signs since so many different diseases can cause them. “But certainly, if you have a dog with increased liver enzymes and that kind of clinical sign, then that may make you a little more aggressive about how you approach that dog,” he says. He says it's also important to remember that dogs with hepatobiliary disease don't always display clinical signs or have abnormal physical examination findings."
I linked the drug carprofen since it's used as a post-surgery pain killer, so you don't want a another vet to prescribe that after a spay.
Good luck.