I imagine Kelli O'Hara is the most sought-after musical theatre actress of her age working today (maybe topped by Sutton Foster, and I mean actresses who exclusively do musical theatre, not TV/film actors like say Anne Hathaway or Amy Adams). Even if I like Chenoweth a lot better (and think she has much more star appeal), O'Hara has proven to be much more versatile seamlessly going from PIAZZA to SOUTH PACIFIC to BELLS ARE RINGING (and doing a whole lot of other work in between) getting raves from critics along the way.
And I might be reading too much into it but when she says that her teacher told her she might not want to be as ambitious as Chenoweth, it makes me wonder if there is some kind of warning regarding the lengths that an ambitious person like that would go to, but again, I might be reading way too into the comment.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"