We found her with her face down in the pillow 我们终于找到了她 她却已将自己深深埋在枕头里;
所以:bury one's head in the pillow 这虽然不是个词组,但是这种说法说得通.
bury in 是词组.
我举个句子,只是想说明有" in the pillow "这种说法.