Probably to keep her from hurting herself to get away from the stress, like why she's always in restrains.
With the cat, I could be wrong but I think it's implied she just sees a normal cat so in the future SCP 529 will only be the back half instead of just the front.
Oh so that's it, Thanks.
I never read the wiki. (I just know there are wiki after I read about 20 chapter of this manga hha).
So I don't know the background of the organization and how it works.
This incident is too mysterious to have a concrete conversation about as SCP 187 can see two states of a substance while SCP 343 has a different appearance for each person.