。
It looks like she's coming.
Literal
[topic-は] come [seems-そうだ].
~そうだ here is the visual-evidence そう ('looks like, seems based on appearance'), attached to the verb stem やってき (from やってくる 'to come'). This そう is distinct from the hearsay そうだ ('I hear that...'), which attaches to the plain form. やってくる is a slightly more vivid 'come' than plain 来る, often used for someone or something arriving on the scene with a sense of approach or impending presence.