If the WTS helped make the will, they would be the main if not the sole beneficiary. You do not say if you are in the will. If so consider yourself fortunate. If not, and it is a notarized document, don't bother trying to contest it unless it was clear that your mom was incompetent at the time the new will was made.
Executors are usually given liberty to pay themselves for services rendered and often take between 3-5 percent of the estate. They are also often given liberty to distribute movables as desired unless recipients are specified in the will and sell or liquidate immovables which become part of the estate funds.
Your sister, if executor, has full rights to handle the estate within the parameters that wills in your state provide. My suggestion is to work with her unless she does something that represents a breach of her mandate as executor.
BTW, if you are named as a beneficiary in the will, the executor is required to provide you with a copy thereof. If not, you are not entitled to anything. Good luck.