You should really go to genetics 101 again. If these features were defined by a dominant gene (rather allele), Lucy may have only one copy of those and a child may very well have none. And recessive genes do not simply make the phenotype skip a generation, instead if the MC had one copy of the recessive gene, a child could show the phenotype. If the MC has none, it would depend on the partner of the child (and its children, and grandchildren, ...) whether the phenotype ever appeared again.
Also, there is no measure of advanced phenotypes or anything. Genes are just what they are. Dominant or recessive (or co-dominant, or incompletely dominant), that is mostly just random. Many generations of evolution are required for better phenotypes to spread over a population and even then other phenotypes may still exist.
And all of this was just the very simplified version. Phenotypes, especially complex ones as tails and ears, are not usually defined by single genes/alleles, but by a complex interaction of many of those. Also, dominance is not a trait of an allele, but rather the relation between two different alleles and an allele that is dominant to some allele may be recessive (or co-dominant, or incompletely dominant) to some different allele. tl;dr It's complicated, it really is.
. Same MC, same girls just with tennants
