Well, to barrow logic from mothers of long ago: if person x jumped off a brodge would you follow?
In other words, the fact that your wife got baptised at 15 dosent make it any more smart for someone else. It also dosent make it legal or mean your daughter was smart enough to know what she was doing.... Your point remains valid and on target. At 15 neither you nor your wife would have allowed to marry. The org preaches baptism as even more serious.