I am sorry for the loss of your mother. The property appraiser's office is aware of your mother's passing, probably through social security records. That is why their website is showing that her share is owned by her estate.
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The reference to "est. of" indicates that the property appraiser is aware of your mother's death. You should consult with an experienced real estate or probate attorney to review the Deed. Many times a Deed does not include proper survivorship language resulting in the need for the probate of an estate. The opinion will be easy to obtain once the lawyer reviews the Deed.
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I could give you better details if I could see the property tax record and the deed that you refer to.
Dennis Phillips is an attorney and financial planner based in South Florida. He is a member of the Florida bar, he holds the nation-wide Series 65 Investment Advisor license, and holds an insurance license in Florida and Virginia. Disclaimer: The response above is not legal advice and does not create an attorney/client relationship. The response is in the form of legal education and is intended to provide general information about the matter within the question. Oftentimes the question does not include significant and important facts and timelines that, if known, would significantly alter the above response.
I agree with the other responses but to fully understand your options and any difficulties you may encounter (e.g., if you were to sell the house), you should consult with an attorney.
Douglas R. Coenson, Esq.
It means that your mothers estate will have to be probated before it can be transferred
to the new rightful owners.
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.