I am not sure if Davila is Hispanic, but if it is I think it is customary for the womens name be last. I know when they have children the mothers maiden name is last.
Either that or she is a real lib like Hillary and kept her name.
Since she's his ex, and no longer his wife, she may have kept his name and appended either her maiden name, or that of a new husband. This is sometimes done to simplify things when there are children involved. The Hispanic practice, for married women, is to drop their mothers maiden name and append de (of) and the husbands family name. Thus when Guadalupe Zapata Rodriguez marries David Torres Flores she become Gaudalupe Zapata de Torres. Tejanos don't generally follow this practice though, at least not the ones whose families have been here awhile.