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Her mother ( ) in a hospital ,but she ( )there these days.

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Her mother ( ) in a hospital ,but she ( )there these days.
A.works ,isn't working B.is working ,works
C.works ,not work D.is work ,don't work
本来我是选择C的,可是答案选择A
isn't后面能加ing吗?我选的C哪里错了啊?
Be +doing
如果选了C 应该是 she doesn't work
+not的只有 be动词 do 情态动词(must之类)