I’ve been communicating recently with another mom with the same problem, and I’ve been thinking. I do not KNOW that any of these would help, but offer these as suggestions only.
Perhaps your child is simply focusing too keenly on just the specific words, stressing over remembering them. Perhaps you could try reading for a bit, then YOU narrate a bit, maybe once or twice, THEN ask her, so that she isn’t expecting exactly when you will stop and ask her.
OR possibly, she just needs time to adapt to such an oral-language learning method. Does she often wiggle? Have you thought of letting her try holding a squeezee ball or sit on the floor and color while you read? Maybe this would take some of the pressure off of her.
OR, perhaps she needs a little time to “gell” her narrations? I have one son who gives sometimes poor narrations right after the reading, but can do better when Dad gets home, or after a little time passes. You might try that, I suppose it can’t hurt.
Also, be sure and “intro” in to each reading, asking what she remembers from last time. How does she respond in those times? You might say something like “Oh, yes, yesterday Heidi brought home those kittens. Let’s listen and see what happens today! What do you think will happen?” then read a bit.
Dont’ know if any of these will help, just tossing out ideas that came to me as I thought of another mom’s similar problem.