At 7th level, the sacred fist gains a ki pool. This functions as the monk class feature, using the sacred fist's level – 3 as his monk level when determining the number of points in his pool and bonuses granted to his unarmed strike.
and
monk wrote:
At 10th level, his unarmed attacks are also treated as lawful weapons for the purpose of overcoming damage reduction.
Seems like RAW a Sacred Fist gets Lawful ki strikes (even if she's Chaotic). True?