。
It seems likely that she'll come tomorrow.
Literal
Tomorrow she [subject-が] come [quotative-という] [nominalizer-の] [topic-は] seem-likely thing-is.
Layers several structures: という nominalizes the content clause, の turns it into a noun phrase, は marks it as the topic, and ありそうなことだ ('a thing that seems likely') is the comment. ~そうな is the conjectural suffix in its pre-noun adjectival form.