I'm trying to bypass remote management

You will need to contact the company she worked for and ask them to unlock it. If it was a company issued phone, then that means she stole it and you are in possession of their phone.

I would suggest you return it to them as they have the means to track the phone and if they want, you could be arrested.

Not going to happen. Who put the MDM on your phone? You need to talk to them to manage it or remove it.