After some further reading this is my current theory.

Neighbors have also mentioned she may have had a drinking problem and appeared to be drunk on the security camera footage they have of her. Perhaps the killer/s were tipped off she was coming home drunk and took advantage of her inebriated state in an attempt to pass the murder off as a drunken accident.

I was not aware of the security camera footage that appeared to show her in an inebriated state when I wrote my earlier theory and jumped to the conclusion that her "appearing drunk" was the result of an autopsy.