Stelle was later found mangled like a chew toy after what is believed to be a form of unethical usage of a command seal. She's currently receiving medical treatment in Penacony Grand Hospital and is unable to provide any explanation for why she issued the order

this is how to cause Saber to remove her Ahoge and go Alter on your arse

The Morgan inside her can't help but be mean to her sister.

Considering Saber can resist Command Spells to a degree Stelle will need to use another one (like Kiritsugu had to do)

Stelle, what you doing? You do NOT separate Saber and her sandwiches