Reibun
、。

Since she got pregnant, she thought of her health and quit smoking.

Literal

She [topic-は] became-pregnant [because-ので], health's matter [object-を] thought-and tobacco [object-を] quit.

A causal chain in three clauses: pregnant → thought of health → quit smoking. ~ので gives the reason; the te-form 考えて links the thinking to the quitting. 健康のこと ('the matter of health') uses こと to abstract the topic — 'thought about (the matter of) health.' タバコをやめる is the everyday phrase for 'quit smoking.'