I have doubts about this - she went on to pull things out of the fire for the team with her beam routine.
She stopped vaulting in competition after this for a while and has only just gone back to two vaults.
And Camelia had a meltdown on the sidelines, so it doesn't look as if sacrificing vault was in the Voinea family master plan. Sabrina was considered as much a vaulter as anything else at that point.
I can see why people would believe it and I remember gossip at the time, but it doesn't add up at all for me. I can believe that Sabrina wasn't pushed to prioritize the team score but she was a potential finalist on vault as well as floor and beam back then.