她什么时候走

不用dose，而且句有错，这是宾语从句，用正叙
整句：But I don't know when(或what time) she is going,
或But I don't know when she will go
dose和ving 不同用！！！

hahahahaahaahahahha???????????????????How old are you???I am laughing!!!!!but I don't know when she will go

不是，应该用will 因为还没发生。而且词序要放对：but i don't know when (或at what time)she will go.

but i don't know when did she go.应该用过去时。