According to the Tas convict permission to marry, your Charlotte Blears finally married in 1846 to John Dawson as shown:
BLEARS Charlotte Woodbridge WILCOX Joseph free 00 DEC 1845 CON52/2 p392 BLEARS Charlotte Woodbridge FRY Henry free 01 SEP 1845 CON52/2 p62 BLEARS Charlotte Woodbridge FRY Henry free 03 NOV 1845 CON52/2 p62 BLEARS Charlotte Woodbridge DAWSON John Layton 13 APR 1846 CON52/2 p44
Elizabeth Wilcox was born 8th April 1846 at Launceston, father Joseph Wilcox, mother Charlotte Blair.
The pioneer index shows no marriage for a Joseph Wilcox or a John Dawson.
One Charlotte Blair age 28 is listed as marrying a William Higgins at Launceston on 2nd Nov 1852.