I have looked through all of my marriage record abstracts and did find where a Mathias Barringer married Margaret Dry on March 7, 1827.Abraham Dry was the bondsman and Daniel Coleman was a witness.I also show that Andrew Dry MAY HAVE been Margaret's father, but I have no idea where this bit of info came from.I have no record nor recollection that Andrew had a daughter named Margaret.I do show however that Peter Dry, who married Hetty Elizabeth A. Teter in 1809, had a daughter named Margaret.I do not have a date of birth for this Margaret, nor do I have further information on her. She could be your girl.Peter was the son of J. Martin Dry and Catherine Keppel. This J. Martin, we're reasonably sure, was the son of Charles Dry and Christina Muss.
I sure would love to help you put this connection together so that I can further expand my Dry/Drye database.
Please contact me via private email and I'll send you more on the Dry/Drye family.I also have a private Dry/Drye family website that I'll glad to send you an invitation to if you are interested.