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You can sue the owner for breach of your lease if she is improperly harassing you and interfering with your peaceable use and possession of the premises. As far as the bed bugs, in order to hold the landlord liable, you have to prove that the landlord failed to properly maintain and clean the premises and failed to properly exterminate the premises as required. So, if they had no notice and they did not cause the bed bug issue, they could not be liable I am afraid.
So you could pursue her for breach of the lease and failure to properly exterminate the premises.