Ka-uapameua. It is/was as if she is/was seeing him.

The Independent Indicative Perceptive (#02)  is always preceded by the particle ka-. It is used several ways. One is to describe things that happen in a dream or in a dream-like state.

Ka-nimitshishunaua eukuan eshinaman. I was eating in my dream.

Another common usage is to create relative clauses of the type that one among others. In this case, the ka- is not optional.

ne napeu ka-taua. the man who was present.

Link to the conjugation guide.