प्रतिषिद्धायां द्वादशपणः ॥ कZ_०३.४.०२ ॥
pratiṣiddhāyāṃ dvādaśapaṇaḥ.
If she is under a specific prohibition/restriction, the fine is 12 paṇas.
Noncompliance with an explicit restriction is treated as more blameworthy than ordinary boundary-crossing, so the fine is increased.