I'm not sure how to solve for this, but I'm trying to instill that conversations and interactions have to be two way, so just because "you are interested in X" doesn't mean that talking at someone over and over about things they are not interested in isn't a way to foster satisfying interactions for all parties involved.
A parent might placate and be always "oh that's so interesting!", but their peers? Their peers might ignore them leaving the kid confused as to the response.
It's the interaction. She wants you to read the same book to her because she knows that you do the voices and act it out and she gets to interact. That's the point. If you ask them, they'll tell you what they value. You don't have to think your way around them, they know, even by the time they're 3 or so. People have desires, and they can tell you what they are, with some help and elicitation.
I am sure if she came over to your place for 50+ times she would also act different than the first time. I think It’s ok to be bored with a 2 year old request to show the same book or the same picture over and over and over again.