I organised a group ride this morning, with grouping enabled and meet up view. One of the riders was sent in opposite direction to the rest of us and we can’t get her back
Do they have the latest version of Zwift?
Maybeeeee… 
They accidentally hit the U turn button… Are they new to Zwift? Also as @Paul_Allen said it could be the update
Yes, it was updated last week I think.
The u-turn button doesn’t show up on meet ups. At least it doesn’t for me or her.