OK. So it's quite obvious she pulverized your EGO, and you are
resentful about that.
Let it go, ego has no place in the workplace.
Now, frankly, I think both of you are so immature , if I am the
boss, I'd buy both of you small frys a doll house to play with at
work.
Next time she ask you to pass a message on her behalf , you
should respectfully decline and tell her to speak directly to that
person herself.
Is being a doormat part of your job scope ? I'm quite sure it's
not.
The only person who can treat you like a servant is your
boss.
You can still be friendly with her, but keep a distance if she
is the kind that bully juniors. Open your eyes and recognise who
are your allies or enemies.
I suggest you keep co-workers as co-workers... seek your
friendships OUTSIDE your work environment. SEPARATE personal life
vs working life.