Laura hasn't had any vocal health problems, so I'm not sure what you're implying.
And prior to her run in Grease, she was an apprentice at The Children's Theater Company in which she was singing 8-show weeks for a year straight, so whether she is up to it isn't really a question. She has already demonstrated that she has the stamina.
"You just can't win. Ever. Look at the bright side, at least you are not stuck in First Wives Club: The Musical. That would really suck. "
--Sueleen Gay