Interest of administrator of veterans affairs.) The interest of the Administrator of Veterans Affairs in the estate of a ward shall be limited to that part of the estate, invested or uninvested, which is derived from payments made directly to the estate by the Veterans Administration. When a part of the estate of a ward is derived from sources other than the Veterans Administration, it is presumed that authorized or approved expenditures made under Section 11-13 are made first out of receipts from the Veterans Administration unless it appears otherwise from the order of court authorizing or approving the expenditures.