Your guardian was promptly acting on the only information available, even thought it was false. You probably have little if any recourse there. You can use the evidence you claim to seek to petition for an end of the guardianship, or replacement of the guardian.
To the PROSPECTIVE client, please call myself or another attorney for your choice with more detaiils and an appointment. My PRELIMINARY answer to your question(s) is for general purposes and based upon what little information you have conveyed. It is based on such limited information that the general answer should never be relied as a reason for your action or inaction. My response does NOT establish an attorney-client relationship and such may only be established by mutual agreement, and the signing of a written retainer agreement, which will generally require payment for our services, as this is what we do for a living and, just like you, we must get paid for our work.. .
I would just replace the Guardian if that would give you peace of mind.
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.