whether you like it or not - female Servers are permitted in the RC Church. It is left to each Bishop to decide whether they will permit it in their Diocese.
There are many parishes where boys will not come forward to serve - so either the Priest is on his own - or he has girls.
Our's is a "diversity" diocese (so it seems) and the girls are often "on the altar" so to speak, in some parishes. But my parish pastor, who celebrates the TLM weekly or more as well as the NO, seems to have a methodology to counteract it.
One recent Sunday I had to attend the Noon NO Mass, which the pastor was serving, and, by coincidence, during the announcements he mentioned that with the end of the school year, there would be a new class forming for the boys who wished to serve at the altar; "or girls, for that matter" he added with a smile. The context is that, de facto, no girls serve on the altar (though there are ladies who serve as readers for the NO), and the boys dress in cassock and surplice!
So, while the girls are free to take the classes, it sounds to me like the boys wouldn't want their sisters around, and vice versa! It wouldn't be
One of the arguments against female altar servers is precisely this: it will create more situations of needless conflict and alienation inside the sanctuary.
Having an "unspoken" rule whereby girls are technically allowed in the sanctuary and yet tacitly discouraged from availing of this permission, will only create dissension and anger among not a few girls and women. Why tell them that they can come in, then work so that they'll remain outside? Consistency is the key. Either they are allowed to serve, or not. Period.
Besides, keeping out girls in this manner -- telling them that they can come but with the unspoken rule that they do so at their peril -- can be kept up only with some amount of subtle or not-so-subtle bullying and other pressure tactics. Do we really need that kind of behavior among the servants of our altars?
Finally, we can be certain that not a few female altar servers, serving frequently at the altar, will eventually think: why can't I be a priest?
After all, vocations have been traditionally developed through altar serving. The proponents of female altar servers knew what they were doing in the 1970's and 1980's!
In short, it would have been better if the old liturgical laws on this matter -- affirmed as late as 1980 and 1990 by the Holy See only to reverse it in 1992 -- had been kept. Now that the Holy See has allowed it, we have to rein in the consequences -- a task that can be accomplished only with great difficulty.