L i N d $ @ y

I re-watched a bit of part 2 and the part where we first see Leta talking to Newt at the Ministry. They were reminiscing about their Hogwarts days and then Theseus came. I think it was implied in that scene that she met Newt (and Theseus) at Hogwarts (we haven't seen the flashback yet because this was the early part of the movie).