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This sounds pretty much like a "set up." If you were out of the office, then you were out of the office. So someone in your situation could not see a patient be they deaf or not.
Also if they really had an attorney, then you would be hearing from her attorney shortly.
Very likely, the mother is attempting to scare you. Soon, your office will receive a call from her offering not to sue, if money is paid.
In short, this is a scam. Even if the mother that this is real, this would be a weak lawsuit because you really were out of the office and that in itself is the defense.
Someone in your situation may also wish to remind that person that your office can counter-sue for (a) defamation, (b) malicious prosecution, and (b) other related causes of action based on her lies, and ask the court for attorney/legal fees and sanctions.
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