he doesn\'t dare to go home alone,does she?她不敢独自回家,这句话中dare为什么做了实义动词?

很简单,因为前面用了助动词does,所以这里的dare肯定是实意动词.
如果dare是情态动词,是不需要加助动词,对比：
She dares not go home alone 情态动词
She doesn't dare to go home alone 实意动词лл��