Hello
Right - so we've had a good dig about and we're extremely sorry to say that it looks as though we made a horrible mistake here.
There was a lot of unrest on the boards at the time about possible trolls, especially those posting about premature births and/or bereavement. When we looked into nobblybobbly19, our back end systems flagged a connection to previously banned posters. These connections aren't failsafe indicators that someone's a troll, but we were on high alert for returning trolls posting about these sorts of topics, so we - unusually - erred on the side of suspicion and deleted the thread.
We didn't hear any more about it from nobblybobbly19 - quite often, if we ban people in error, we'll be contacted by them asking what's going on, but that didn't happen here. Obviously, in this case this was probably because nobblybobbly19 had many more important things on her mind, but it also means we weren't prompted to review the decision until now.
So overall it looks like a few factors (our back end systems indicating a match with banned posters, the broader context of returning banned posters starting threads about premature births/bereavement, and the OP being understandably preoccupied) led to us making a horrible wrong decision and not realising that we'd done so.
We will contact nobblybobbly19 to apologise.
Huge apologies all round.