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I don't know how to word this but
Because Aliss is deaf she never knows what's going on directly behind her
I'm making an assumption but i would guess that she hates people being behind her because of this
The monster means that people can't go behind her
Although the monster was terrifying and evil, it was predictable, so Aliss knew it wouldn't hurt her while it was behind her
I wondered why she didn't immediately tell the doctor why there was something behind her and why she was willing to take it back to her planet and her daughter
But maybe she subconsciously wanted to take the monster back with her because it would ensure that people didn't go behind her