。
She's really attractive.
Literal
She [topic-は] really attractive is.
すごく is the standard adverbial form of すごい — used to intensify a following adjective or adverb. 魅力的 ('attractive / charming / appealing') is built from 魅力 ('charm / appeal') + ~的 (the productive ~ic / ~al suffix that turns nouns into na-adjectives). The word covers physical attractiveness, personality charisma, and the appeal of ideas or proposals (このアイデアは魅力的だ 'this idea is appealing'). Compared with かわいい ('cute') or きれい ('pretty'), 魅力的 reads as a more mature, considered judgment.