Wren being scared of the monster is also among the reasons why Olson lost the connection to her mind, because she suddenly got so scared and let the voices from her past infiltrate her mind.
He's still trying hard to connect to her before Wren would become too scared in her mind and fail to find his voice and follow it as a guidance.
If he fails to connect to her and Wren also fails to connect to him, then her mind might be left in a great chaos, which might leave her in a subconscious state forever.
****
Inside Wren's mind.
Wren suddenly felt intense pain in her head, there were different loud voices and screeches everywhere as if a banshee was screaming directly into her ears, so she covered them. Trying to calm herself down and find Olson's voice only, just as he told her to.