。
She loves Tom.
Literal
She [topic-は] Tom [object-を] loving-is.
愛する is the heavy, dramatic verb for 'love,' usually reserved for romantic devotion, family bonds, or abstract attachment. Everyday Japanese leans on 好き for romantic interest; 愛している tends to surface in confessions, fiction, and translations rather than casual chat. The ~ている form turns the action verb into an ongoing state — 'is in a state of loving' — which is why love, knowing, living, and similar verbs almost always appear in this form.