Her health has been affected,and may_altogether if the strain continues.

选A

break down 毁掉, 制服, 压倒, 停顿, 倒塌, 中止, 垮掉, 分解
break off 中断, 折断, 突然停止, 脱落, 暂停, 断绝, 解除
break out 突发, 爆发, 叫嚷, 使作准备, 取出, 倒空, <口>把...备好待用
break up 打碎, 破碎, 分裂, 结束, 衰落, 分解, 变坏, 驱散

她的健康已经受到了侵袭，而且如果继续过度疲劳继续的话，可能会累垮。

A.break down

break down:

vt. 打破(减轻,坍塌,彻底失败,精神不支,中止,把分解)

例句与用法:
1. Her health broke down under the pressure of work.
工作的压力把她的身体弄垮了。

2. The telephone system has broken down.
电话系统失灵了.

3. Negotiations between the two sides have broken down.
双方谈判已经破裂.

4. He broke down and wept when he heard the news.
他听到这个消息时不禁痛哭起来.

5. If law and order break down, anarchy will result.
法治一垮, 就会出现无政府状态.

6. Expenditure on the project breaks down as follows: wages 10m, plant 4m, raw materials 5m.
该工程费用开支可分成如下几部分: 工资一千万英镑, 厂房设备四百万英镑, 原料五百万英镑.

7. Firemen had to break the door down to reach the people