Nà yīkè, bēixǐjiāojiā, tā bùzhī gāi kū háishi xiào.
At that moment, grief and joy intermingled, and she didn't know whether to cry or laugh.
Tips
usage
交加 almost always appears after a paired noun phrase describing two simultaneous forces or emotions: 雷电交加 (thunder and lightning together), 悲喜交加 (grief and joy mixed), 饥寒交加 (hungry and cold at once).