Manassa the Serpent Queen goes underground and won't come back up

I'm on a map and there's a snake lady boss which summons snakes and also goes underground. She did her ability to summon a ring of bone spike things, and I was outside of it, so I just stood outside until she did her nova explosion. Then after awhile the bone spikes retracted and I went back into the circle/arena but she was underground and won't come back up. The arena exit is blocked off by a boss wall thing and I can't go out to finish the rest of the map.

Portals are also disabled during boss fights so... I'm stuck unless I log out.

*update* I tried exiting to character selection screen and when I log back in again, I'm still inside the arena. But now at least her hp bar is showing up.

She's afraid xD