I was in that game and I'm gonna just write a letter to a CSR hopefully someone will read it. And not just put it aside saying "haha" shurelia just up to her ol' trolling tricks.
I work in the business world and if my employees were disrupting customer's experience no matter if it was intentional or not, i would be concerned. Even if this was her "off" time she should be using another pseudonym. This is the same as asking an employee to take off their uniform if they want to do something stupid that would make a negative impact on the image of the company.
Obviously she won't be reported, she's a riot employee she has immunity but for the sake of the company's image have her test these builds in a practice game, or if its her own shenanigans then have her use her own username and not represent the company in a negative light.