It depends on the cause, I thnk. If, for example, she has a residual tilt but the infection has gone, or an injury that causes it, then I see no concern with vaccinating- Tilly was vaccinated under these circumstances (her infection had gone), but if it is an active infection then it's too risky, in my opinion.
It's always best to discuss it with your vet though, but follow your gut instinct and discuss that with your vet.