。
She's longing to go abroad.
Literal
She [topic-は] foreign-country [to-へ] go-want [quotative-と] is-yearning.
熱望する ('to ardently desire / yearn for') is a heavyweight word — the kanji 熱 ('heat') + 望 ('hope, wish') paint desire as something burning. It's much stronger than 行きたいと思っている ('thinks she wants to go') and fits writing, dramatic narration, or describing someone's deep ambition. The と here is the quotative particle, embedding 行きたい as the content of her yearning — exactly the same と you see with 思う, 言う, 感じる. Note also へ rather than に for the destination: both work, but へ slightly emphasizes the direction or trajectory ('toward foreign lands') rather than the endpoint as a fixed location.