Her breathing technique is horrible. When I saw her on the Tony's I thought she was having an athsma attack. She wasn't using her diaphragm at all and she was gasping for air every few words.
Keeping your tongue down and relaxed is the only advice I have ever gotten from my vocal teachers.
Of course, everyone is different, but I really think she has terrible vocal technique and I will be suprised if she has any voice left in a few years.
"When you're a Jet, / You're a Jet all the way, / From your first pirouette / To your last grand jete." --Brian Kaman