Back in August, I took my 20 year old daughter to this breakfast. She was so excited and didn't put the camera down. She was taking pictures of me with the characters, I was taking her's and the folks at the table next to us were taking our pictures togther. This was a great experience for us!
I'm a single mom and have never been able to afford this kind of thing before. Typically, we go to WDW but never really get to interact with the characters too much. After 20 yeras of that, my daughter thought this was the biggest treat. The way her eyes lit up with excitement and the smiles illuminated from her face were worth every penny. It was made so much sweeter because we had never done it before and it was all so fresh. I can't even tell you how wonderful.
Don't give it another thought! Just do it! Be a kid about it and embrace every moment with your adult daughter.