。
It looks like she's munching away on a feast over there.
Literal
She [topic-は] over-there [at-で] feast [object-を] is-munching [seems-ようだ].
ぱくつく ('to munch, to gobble, to chow down') is a verb derived from the mimetic ぱくぱく (the open-and-close mouth motion of eating). The mimetic root colors the verb with cartoonish energy — it's the kind of word you'd use for someone eating with gusto, not a refined meal. ごちそう ('feast, treat, fancy meal') is paired naturally with hearty eating verbs. ようだ ('it seems') hedges the observation, fitting since the speaker is presumably watching from a distance. 向こうで marks the location ('over there') with action-で.