It’s probably best she thinks I'm an outsider from somewhere else on her planet for a little longer. If ponies react like humans, she might be frightened or angry with me if she learns I'm from further. Much much further. Of course, James would tell her the whole truth, when the proper time arrived. When it was time to return with her own language mission completed, James intended to bring her along for that final report. That would be the perfect time to show her everything, unless something happened sooner to necessitate being more open.