No man can serve two masters. Ye cannot serve Jake and Ceraph.
Peony clearly has a lot still to learn, and trying invoke the powers of a god she's renounced isn't the smartest idea either.
To be sure, she needs to get better at bluffing her way out of such situations.
Hopefully Mary doesn't have the power of her DMFA/Project Future counterpart or Peony will be in a lot of trouble.