She would stop me on principle. All Puella Magi are essentially rivals over the Grief Seeds... she'd think I was trying to keep you from contracting just to keep out the competition.

She honestly thinks the contract is a good thing. It's as if she just doesn't think.

And... forgive me for saying it, but you, if uninformed, would always listen to her judgement over mine. It is the same as with Miss Akemi.