Since he was using her powerful spiritual attack to fight her weak mental attack, there was no way she was going to win. She didn't know this, but she realized that trying to break the Mind Node wasn't working.
This realization also came with an understanding that she might lose the undead giant and her undead army to Loki. This made her anxious and desperate.
In her desperation, she made her Mental World delve into the Mind Node and clash with the mind of the Mind Hunter directly. She doesn't think she will be victorious in this clash, but she didn't have anything else to do and didn't want to give up so soon.
Her move to strike at the source of her problem was successful to a certain extent. It was successful in that she was truly able to reach his mind through the Mind Node. But that's as far as she could go.
Her mental world was a colorful sphere with scenes of a graveyard and corpses all over the place in it. There was also a flock of crows flying about in her mental world.
