She doesn't say that Tom is playing puter games
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这个是含有宾语从句的反义疑问句,要小心.如果主句主语是第一人称并且谓语是表示思想性的动词,如：think ,suppose, guess, consider.等,反义疑问句与从句一致；
如： I think she is right , isn't she?
反之,与主句一致.
在这句是与主句一致,所以是 does she?
如果主语换为指人的不定代词,反义疑问句的主语可以用they或者he, 即 do they? 或者does he?
如： Everyone knows the answer, don't they?或 doesn't he?
如果主语是指物的不定代词,反义疑问句的主语用it.如： Everything is ready, isn't it?