Ellen doesn't have anything against bowling either, so let's go!

have 是动词，意思是"有"或"持有"。 anything 是不定代词，意思是"任何事物"，常用于否定句或疑问句中。 against 是介词，意思是"反对"或"对抗"。 have something against 是一个固定短语，意思是"对...有意见/反对"。这里用否定形式 doesn't have anything against 表示"不反对"。