No, the executor carries out the will; she must do what the will says and distribute the estate to the named beneficiaries. The executor whomever it is, cannot depart from the terms of the will. The identity of the executor does not affect who inherits what. That said, if she needs or wants your signature, you can insist on seeing the will before you sign; and if you end up believing that the will is fraudulent in some way, speak to a probate attorney about challenging it.