I like all six sentences. None is wrong, though some are more or less commonly spoken. The issue though shouldn't be how common it is. Rather, the issue is what effect you want. If you like the sound of "Here comes the three year old Amanda!", then say it.

Good question! In general, think about whether it would sound correct to use the definite article ('the') without the adjective. In A2, if the adjective is '3-year-old', and we remove it, it doesn't sound correct to say 'This is something the me would have like'. So A1 sounds more correct. In B1, it doesn't sound right to say 'her sister, the Amanda' so B2 sounds more correct. C1 and C2 are both correct. In English we can say, 'written by writer ...' or 'written by the writer ...'. The C1 construction is more common in journalistic writing, because it is shorter and more direct.