If (i) a will is of doubtful import as to the amount or value of the property the surviving spouse of the decedent is to receive thereunder or (ii) the composition or value of the augmented estate is uncertain, and an action to resolve such issues is pending, the court in which the action is pending shall, upon the application of the surviving spouse made within the six-month period set forth in § 64.2-302, enter an order extending the time within which the surviving spouse may make a claim for an elective share. Such additional period within which to make a claim for an elective share shall not exceed 90 days after a final order has been entered in such suit, either by a trial court or any appellate court to which it is appealed.