but then why have regina that letter. She said she read it during training. She did go to WL to get her father out, maybe she get the letter by training when her mother visisted her and took Henry with her. That was always missing and could fit.
Regina didn’t said she read the letter during training, she said she read the letter in times of solace, etc. which means she discovered when she was already the Evil Queen, but what’s tricky is that let’s say she find the letter in Cora’s crypt (after she died last season) when Rumple gave Cora this letter if this timeline right?