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Thank you for your question.
As an LMFT, you are protected by the privilege specified in Evidence Code § 1010.
As noted here,
"The psychotherapist who received or made a communication subject to the privilege under this article shall claim the privilege whenever he is present when the communication is sought to be disclosed and is authorized to claim the privilege under subdivision (c) of Section 1014."
You can phone the attorney who issued the subpoena and explain that you are required to claim the privilege unless your client waives the privilege, and you are willing to obey the subpoena if they pay the witness fee but that you will not answer any questions relating to your former client. Maybe that will convince the attorney to withdraw the subpoena. If possible, you could try to speak with your former client's attorney prior to phoning opposing counsel.
I hope this information is helpful.