When can you sue for slander?

Question Details: I owned a pet sitting/training business. I had a lady bring me her puppy for training $200 she claimed he threw up a sock and she took him to the vet the next morning. She told me the bill was $209 and she wanted a full reimbursement for that. I told her I would reimburse her if she provided me with the itemized vet bill because I wouldn't refund her for routine vet care, she refused. She told me I could contact her vet for the bill, so I did with no response. She then posted on Facebook a post stating I almost killed her dog, and that I'm an untrustworthy person and to not trust my business. I lost business over the post. She then said she wanted reimbursed for the training fee because it was not successful, she said this months later. I do guarantee my training but not with money back. She has since filed for small claims court stating I refused to reimburse her training fee, first Ive heard of her waiting that training fee back originally she wanted the vet bill back which I agreed to, now shes asking for $350. I was just curious if I would have any luck with slander/libel or something positive on my side for this case.

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