With all due respect, I don't know how you can assume it wasn't Tianna's decision. And, personally, I think it's time to just congratulate little Madison and wish her all the broken legs in the world!!!
I am going through a hard time with my daughter with regard to college auditions right now. Part of her wants to get away from home, but the other part wants her to stay home. I told her she needs to look inside her heart and make that decision. Perhaps little Tianna and her family felt touring wasn't for them and decided that she'd rather stay home and either audition in her area (which is Orlando and wonderful for theater!) or just be a kid. And, if Amanda and her family love the touring life and she's been offered a chance again, then go for it!
In any case, little Madison has an adorable face and will be a wonderful Annie. What an opportunity for that little girl!