Are we counting what JW said for sure for purposes of this question, or are you asking for sources outside of him?
If we are counting JW's answers as for sure, yes, she went to the game and left at half time. Seven was found 3 hours later on the 28th or 29th floor of one of the H+F towers, which was around 7 p.m. according to MSM reports published after the surveillance video was published.
If we are looking for confirmation outside of JW, LAPD has simply said she was last seen in Downey on the 7800 block of Gardendale St. and that HP's dog was recovered without her in Los Angeles. (
LAPD MPU Twitter.) I'd have to go back through the MSM articles to see if LAPD has confirmed anything else, but I can't think of anything off the top of my head.