Alyssa would save Xavier between the three in that situation, so Sarah Beth would be stuck on that block unless she won the veto.
The easiest way to get Sarah Beth Steagall out at this point is to nominate her next to Kyland Young, which would remove the one person that would take her off the block.
Plus, Xavier Prather will be the third nominee this week due to his punishment tied to winning last week’s veto, which would handle the rhetorical situation where Alyssa Lopez won the veto.
That’s not impossible, but it does highly stack the odds in Tiffany’s favor.