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If she files a return with her spouse, you will not be able to claim her.
If she doesn't, you can claim her as a dependent provided that all the other dependency tests are met.
Let me know if you have more questions.
Her husband cannot claim her as a dependent. A spouse can never be a dependent but her husband can get an exemption for her.
If she files jointly with him, you cannot claim her.
If she does not file jointly, you provided more than 50% of her support and she meets the age and income test, you can claim her.
Let me know if you still have questions.