off your guard vs off her guard

off your guard and off her guard both are adjectives.

Word	Noun	Adjective	Verb	Adverb
off your guard	No	Yes	No	No
off her guard	No	Yes	No	No

As adjectives, off your guard and off her guard are synonyms defined as:

Other synonyms of off your guard include napping, off-guard, off guard, off his guard, off one's guard.

off your guard (adjective)	off her guard (adjective)
not prepared or vigilant	not prepared or vigilant