。
She told me not to tell lies.
Literal
She [topic-は] me [to-に] lie [object-を] tell [must not-てはいけない] [quotative-と] said.
うそをつく — literally 'to attach a lie' — is the standard collocation for telling a lie. The verb つく here is 付く ('attach'), not arriving-つく — Japanese has multiple homophones distinguished by kanji and context. The prohibition pattern ~てはいけない ('must not X') is the everyday firm 'don't' — stronger than ~ないでください ('please don't'). The whole phrase うそをついてはいけない is among the most universal pieces of childhood moral instruction.