All releases, contracts, letters of attorney and other instruments of writing which a married woman is or shall be authorized by law to make and execute without the joinder of her husband, and which have been or shall hereafter be so executed by her, may be recorded in the office for recording deeds in the proper county if the same shall have been acknowledged by her without her husband joining, or her signature thereto shall have been duly proved before a justice of the peace or other officer having authority to take such acknowledgments or proofs according to the laws of this commonwealth. and the said records shall have the same effect in all respects as if she were unmarried; and where any such instrument so acknowledged or proved shall have been heretofore admitted to record in any county of this commonwealth, the record thereof shall be as good and valid for all purposes as if it had been recorded subsequently to the passage of this act: Provided, That this act shall not apply to any case which has been heretofore judicially decided or in which an action is now pending.