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Farrah Abraham says she's been bullied and ganged up on by MTV ... and the main reason she's suing is because she doesn't want her daughter to ever be treated that way.

Farrah was in L.A. Wednesday with her daughter, Sophia -- and a couple cute pups -- and she got into the lawsuit she filed against Viacom, MTV's parent company. She says it's no shocker she's going after them, after she was booted from 'Teen Mom.'