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Here are the relevant taxa:
Meiosimyza Hendel 1925
Lyciella Collin 1948
Lycia Robineau-Desvoidy 1830

Lycia R-D was preoccupied, so Lyciella was erected by Collin as a replacement name. Lyciella then is the valid name for the taxon, with its own author and date (independent of the author and date of the junior homonym Lycia). As such, for purposes of synonymy or determination of rank (genus/subgenus), Meiosimyza has priority. So Meiosimyza is the valid genus, and Lyciella is one of its subgenera.

ICZN article 60.3 is clearest on this matter, stating that if a rejected junior homonym needs a new replacement name (i.e., if there is no available and valid synonym to use instead), this new name has its own author and date, which will then compete for priority with any other recognized synonym.

This isn't something that is subject to "consensus" - calling Lyciella the senior name is simply incorrect. Of course one could refer to Lyciella and Meiosimyza as separate genera, but if they are subgenera of the same genus, Meiosimyza is the genus.