。
She had a Brit check her English writing.
Literal
She [topic-は] her own English-writing [object-を] British-person [by-に] check [received-てもらった].
~てもらう ('to have someone do X for you') is one of the giving/receiving verbs (授受表現); the agent who performs the favor is marked with に (英国人に 'from a Brit'). 点検 ('inspection, check') is more thorough than just 確認 ('confirmation'). 英文 ('English writing, an English passage') is a Sino-Japanese compound — 英 ('English') + 文 ('writing, sentence'). The scenario will be familiar to many Japanese learners and writers: getting a native speaker to proofread.