Document everything. Provide evidence if possible. And find out if and how that employee is hurting the company/division/team. Works for most people, not just fats. Edit: because I just read it. If you're in a state/province/place that you can record conversations without people knowing, then do it. If she doesn't do anything, file it away or delete it. So as to hurting the company, provide the story about blocking your way to help a customer ($$) with a witness if possible, is lazy at her job, and is a health hazard (dripping ice cream). Likely that you being on probation is horseshit, or a different story was told to the manager/higherup.