Answer: A TESTAMENTARY TRUST.
A testamentary trust can be defined as a three-party fiduciary relationship in which the first party, the TRUSTOR, transfers a property upon the second party the TRUSTEE for the benefit of the third party, the BENEFICIARY which is effective upon the death of the trustor and specified in the will of the TRUSTOR.
As can be deduced from the question above, Dotty, the TRUSTOR, creates a will for the benefit of Eppie, the BENEFICIARY.