Right now I lean more toward burglary. Backup theory is a thrill kill from someone who surveilled her but didn't know her. I don't think it was someone she knew, though I admit it's possible.
There is nothing in the media or on here that has eliminated the possibility of burglary. LE has presented that theory and then your theory, and then said they're not committed to any one theory.
Another possibility is vandalism without burglary. He could have wanted to tear crap up and wore the outfit for disguise, DNA containment, protection from rain, and to guard against injury from the damage he was inflicting on glass and metal.