off her guard vs off your guard

off her guard and off your guard both are adjectives.

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

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

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

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