Estate Law Questions? Ask an Estate Lawyer.
This site does not offer legal representation. So, I cannot represent you in the matter. However, I can offer you general legal information
If your sibling has violated her fiduciary duty to act in the best interest of your mother and your mother is no longer in a position to revoke the Power of Attorney given to your sibling, then the prudent thing to do would be to file lawsuit in Florida on behalf of your mother to remove her as the fiduciary--to revoke the Power of Attorney since your mother cannot do this for herself due to her illness. However, you must be your mother's legal Guardian in order to file the lawsuit. So, you have to first domesticate/register any foreign legal Guardianship in Florida in order to have legal capacity to file the lawsuit. However, since litigation is not cheap, you would start by formally requesting information regarding your mother's estate from her. If she refuses, then you would need to retain a local Florida Attorney to file lawsuit against her to compel her to release the documents, and to remove her as the fiduciary.
Each Attorney sets his or her fees based on scope of services. So, you would need to get information regarding fees from the Attorneys that you are considering to retain. It is prudent to contact at least three Attorneys to see which one would be a better match for you before making a decision. Interview at least three Attorneys and/or review their web sites to see which one will be a better match for you. You want to look for someone who is not too busy to handle your case; someone who will return your phone calls in a timely manner, and someone who will give you prompt updates on your case.
You can use the following sites to find local Attorneys who handle estate litigation:
You can also file complaint against her with Florida Department of Elder Affairs for financial abuse. Click on the link below for contact information: