Oprah sued by ex-employee, who claims she was "subjected to a hostile work environment" because of her MS

From TMZ:

A woman who worked for Oprah Winfrey's OWN network claims she was subjected to a hostile work environment ... because she suffers from Multiple Sclerosis.

According to a lawsuit filed August 13 in Los Angeles Superior Court, Catherine Dunn was an assistant at OWN beginning in August 2008. She claims that during her time there, she was "subjected to a hostile work environment" because of her MS.

She claims she was forced to take a stress leave as well of a leave of absence because her MS symptoms were exacerbated because of the workplace stress.

When she was out on leave, Dunn claims she was replaced by "a non-disabled and younger employee."

Dunn is suing for wrongful termination, among other things. She is asking for unspecified damages.

So far ... no comment from Oprah & Co.