sounds like she is tough on you to help you get through this. if it really is something you are having a lot of difficulty with, can you talk it over with her? you both might be able to come up with something that is an acceptable way to communicate that without those words.
I can only guess that she is making you say them specifically because it (in theory) helps with the acceptance piece, and opens the door to talking about it easier. I would personally cringe at that, because I prefer to ease into things. I have found I can talk about my trauma when I talk around it, and I can repeat the words after someone else has labeled it as such, but I have trouble saying it outright much of the time... Maybe a conversation around your discomfort with it would help? Or just thinking about why those words are so difficult for you? would writing around the topic be easier than spelling it out? you could go from there then.
Good luck!