Given the new information ('domestic', husband questioned and released) I have this theory:
Supposedly she was off drinking while he slept (odd...). Perhaps she met a guy and they got friendly (drunk girl flirty friendly, not physically she's cheating friendly). He offers to walk her back to her room and makes a move. Drunk but still with some morals, she pushes away his advances.
The man, drunk, is more aggressive and things escalate. She says/does something that sets him off and the physical attack begins.
There's my theory.
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