Carrie Underwood NOT lip singing???????

Carrie is so awsome. Did anyone see SNL where she came out on Sat. 23? How come people are saying that she was lip singing??? She was not lip singing because if you pay attention you can hear her voice crack in little parts from her cold. Like at the begining of Flat on the floor on the first verse she said "till the damage gets done"on "done" u can hear it when she kinda ran out of breath. That was an amazing performance so idk why peopele r raggin on her saying she was lip singing when she wasn't. I recorded it and i watched it like 3 times to see if she was lip singing and she wasn't. believe me. I mean why would she need to do that when she has an amazing voice.. So why were people saying that when its not true?