There seems to be some strange other wordly creature nestled against the pillow, you should salt and burn it immediately…
Sorry. As for your issue:
I concur with darkest knight that it may well be something she tracked in with her rather than deliberately deployed.
If you no banishing experience, our four legged friend might help:
Safe Servitor for beginners, banishing, protection, shielding and warding - Spirits, Evocation & Possession - Become A Living God
She’s a servitor created by one of our peeps here specifically for banishing purposes.
Another easy and effective beginner friendly option is the Cleanse Any Space ritual from Damon Brand’s book Magickal Protection.
I had to use this one not long ago and found it worked very well.