Rebecca Thomas from Sutton Coldfield is stranded on the Costa Allegra which was left drifting after losing power in the Indian Ocean.
Her brother James, who is also a dancer, escaped from the Costa Concordia when it capsized in Italy last month, killing 25 people and leaving seven more missing.
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Kameron asked what the children who died in the Manchester terror attack "will do in heaven without their mummies and daddies".
A raccoon which got in to a house in Northampton through a catflap has been taken in by the Stapeley Grange animal centre.
The crash, between a car and a lorry, happened on the southbound stretch of the motorway between J15 and J14.