若第一句中的has表完成时,则是She has gone to Beijing.
若第一句中的has表"必须",则是she has to go to Beijing.
若第二句表示过去进行时,则为She was going to Beijing.
若第二句表示一般过去时,则为She went to Beijing.
等等还有很多种改法,楼主要根据具体情况看~