Both she and Elizabeth Berkley...
...may be rich, but not yet completely rich as both Mark and Mario. Although, it looks like both Tiffani and Elizabeth will have their own successful lives on careers and families. But here are the reasons:
1.) Both were substituted by Leena Creel, who plays Tori Scott, in some episodes of the original class' 5th season.
2.) Tiffani never saw a single episode of the new class, so does Elizabeth.
3.) Original fans were complaining that both Tiffani and Elizabeth should have guest appeared in new class episode "Goodbye Bayside (2)". Unfortunately, I disagree. They both refused to guest appear in that new class episode "Goodbye Bayside (2)" because it will endanger both own careers and families. I agree about both this Tiffani's and Elizabeth's correct refusal move and I'm glad both of these women didn't have to guest appear at all either.
Tiffani is having her own successful cooking career and Elizabeth is having her own book-writing career along the way.