She needs to get a lawyer. If her estate is small and her will straightforward, it should not be terribly expensive.
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Attorney Morcroft is correct. Your mother should retain an attorney to prepare the necessary estate planning documentation which will facilitate an easy transfer of her assets upon her passing, as well as to designate someone to manage her finances (power of attorney) and health care decisions if she is unable to do so (health care proxy).
Please be very careful about being involved in selecting your mother's lawyer, bringing her to the lawyer's office and/or participating in a conference with the lawyer. Such activities could be cited by your brother after your mother's death as being evidence of you unduly influencing your mother. You want all decisions to be your mother's alone, with you having no influence on the same. Good luck to you and your family.
This information is presented as a public service. It should not be construed to be formal legal advice nor considered to be the formation of a lawyer/client relationship. I am licensed in Connecticut and New York and my answers are based upon the law in those jurisdictions. My answer to any specific question would likely be different if I were to review a client's file and have the opportunity to interview the client. Accordingly, I strongly urge you to retain an attorney in your jurisdiction with respect to any legal matter.
you need to be aware there are pitfalls in your hiring a lawyer to write the will. you need to have your mom do so. if your mom doesn't write a will then you and your brother will be tenants in common not with survivorship and you may then require a partition. but there are so many scenarios depending on what facts ultimately come out its not possible to answer all you questions. a lawyer visiting the house could be more than her visiting his office but each lawyer is free to charge what he or she believes to be appropriate.. make sure mom asks for fees.
without a detailed review by a lawyer can all the issues raised in your question be appropriately addressed...nothing in this response should be construed as establishing a lawyer client relationship..the answers herein are for informational purposes and not to be construed as advice