Mary Ann Younger (Alice's Mother) was indeed married to Henry Shaw (A Scot, b. 1829 Inverkeithing). They had a daughter, Sarah Ann, b, 1860. Henry died in 1866.
Mary Ann Younger then married John Laws in 1868, I think. Alice must have arrived in before Mary Ann's death (recorded in several other people's trees as 12 Sep 1870 - I have seen a cert) - so there is a childbirth theory...