i see the t's point. children are susceptible to wanting to please adults and so having the first letter is probably far more helpful than the letter you, with good intentions, assisted her with.

that said, the t needed to not shame you. that would have been a better conversation maybe afterward? like 'hey, i know you're trying to help, but i do need to see what she does even if it's not much.' it makes sense your daughter is scared.

idk. how old is your niece? the t's reaction seems a bit dodgy for me. i wouldn't be comfortable putting my kid or anyone's kid alone with a t that is willing to risk 'safe spaces' for whatever the crap he was going for. i'd probably start looking for another t - two sessions is an easy enough time to make a switch.