I haven't been able to find any of Elizabeth's descendants bore the surname Young but I have found several in the earliest generations who died at a rather young age.
Two of Elizabeth's children had short lives. Harriet Westbrook was 14 when she died and William Westbrook was only 8 years old when he died in 1829. We do not know the fate of Elizabeth's child who travelled with her to New South Wales on the Wanstead.
Several of Elizabeth's Grandchildren had short lives. Louisa Clifford lived for only four days in 1833 and her brother William Clifford for five days. Three of William John Westbrook (Magick)'s children, Susanna Rebecca Magick, Anna Harriet Magick and Hannah V died in infancy. Neither Thomas Joseph Ashton or his sibling Harriett Ashton reached the age of 1.
In the Sly family Edwin H Sly and Ernest A Sly had very short lives. Robert H Magick died at the age of 2 in 1861, his male sibling died 1871 and George Thomas Magick was about 4 months old when he died in 1873.
Of Adelina and Thomas Hogden's offspring Robert Hogden died in 1858 before he turned 1 and Herbert Hogden was 2 when he died in 1868.
I would love to have more details of these short young lives. Should you have additional information or find any errors in my post please contact me.