chesedname
It is absolutely not only a reflection of the mother. You can see plenty of cases that go either way with the daughters not following what the mother is doing in this regard. Look at pictures from the 60’s & 70’s and you will see that skirt lenght is approxiamtely the same as now. This means, that not much has changed other than there are more people worried about yennems frumkeit now than there was then. how about worrying about yennems gashmius and your own frumkeit. I know from my mife and daughter that going to a yiddish store to by a longer skirt that will cover the knees is sometimes an act of futility. If the longer skirts would sell, there wouldn’t be problem in finding them. Which would indicate that there is a large percentage that don’t care. Maybe that is what should be addressed, or maybe it is a sign from himmel that the lenght may actually be ok and all the shreing is about chumras.