bypass activation lock

How does that relate to Activation Lock? If your friend removed activation lock you only need to know the password for your new Apple ID. Unless I misunderstand.

If you really want to get your old Apple ID and Password try the steps in this knowledge base article

in order to find your old apple ID

https://iforgot.apple.com/appleid

Try the steps in this knowledge base article if you  forgot your Apple ID Password

If you forgot your Apple ID password - Apple Support

If she cannot remember her account details then she will have to do the two actions at the end of my first post.