Tele, I'm not certain if you brought this up for the sake of your experience with that 18 year-old, but if so I'm actually glad you did because I've been wanting to say that I've been thinking about that and something just recently hit me like a ton of bricks, something I should have realized from the start.
As you said, seduction is a sin. And it occured to me that the 18 year-old at your chapel was acting in a very seductive manner towards you. If I remember the story correctly, she even wanted to speak to you during Communion. As if it's not sinful enough for a woman to act seductive period, doing so during Mass is even worse. I was telling you that your mind should have been on God during Mass, yet somehow I didn't understand that it was her mind that obviously wasn't on God. A shame that she got away with it.
Not that I have a TLM to attend, but if I were to attend one and have a young girl acting flirtatious towards me, I would have tried to ignore her the best I could. And should she have persisted to the point where I could no longer ignore here, I would tell her after Mass in a kind way "During Mass, your mind is supposed to be on God. So I would appreciate it if you kept your mind on God rather than me, it's a distraction". If that didn't work, I would have reported it to the parish priest. Perhaps had you done this you wouldn't have been kicked out of your chapel, but what's done is done. Regardless, she is the one who is primarily to blame for acting flirtatious rather than having respect for God, and she obviously is not a good Catholic. Her parents must not have taught her how to act at Mass.
So, I sincerely apologize to you, Tele, for failing to grasp that on the now-closed "America and Courting 18 year old Virgins" thread. I obviously was having a problem properly comprehending the situation and am sorry for the trouble I caused on that thread.