# Yahweh has mixed a spirit of distortion into her midst

"Yahweh has judged them by distorting their thoughts" or "Yahweh has judged Egypt by distorting its leaders' thoughts, as intoxicating drinks confuse people's thoughts" 

# distortion

"perverseness" or "confusion"

# into her midst

"within Egypt" 

# like a drunk staggering in his vomit

Isaiah speaks of the people of Egypt doing what is wrong as if they were made to wander about like a drunken person.