"If that's case..." This day was just very, very weird, and getting weirder. "Could it be whatever this time manipulation is has reverted your abilities backwards?" It's more Vegeta thinking out the question than asking her. It's also a horrible possibility, the idea that you could lose so much progress without even realizing it, all by another's doing.

However, "Even if your body or powers have reverted, it doesn't mean your understanding of them has." He's seen a variation of this before, but that was more a case of a being taking over another's body and instantly assuming they could use it to the same level of skill as it's actual owner. It may not fully help her, but it may take away some of those fears of falling through items.