Two nine's and two eights for a dance isn't a bad score at all, it's only a disappointing score if you were expecting her to match or exceed either Peter's or Georgia's scores from the previous two weeks and because the short clips that were seen in training looked to be good so it was maybe a possibility.
I agreed with Craig's sentiment when he said overall it was missing an element of Quirk for him, too placed not free or wild enough and therefore came across as too controlled, I knew what he meant because I felt the same.
That said up until the first lift I thought she was doing well, she was in time with Aljaz, matching him step for step, it didn't have the same kind of character as Peter or Georgia's, it was more of an old school Hollywood vibe but that was what they were obviously aiming for so appropriate. From there on though it all sort of went downhill. The dismount from the first lift was awkward and if you slow it down the first kick after that at 0.55 on the clip they start off on completely opposite legs, Aljaz lifts his right knee up as you're looking at the screen and Helen her left although they get back in sync almost straight away and it's fast so not really noticeable on first viewing maybe.
Then they go out of sync again after the 2nd lift from about 1.18 onwards as they go around each other with Aljaz bending his legs from the knees so his heels are coming up almost to his behind and Helen barely seeming to lift her feet from the floor so her legs look tired and she looks like she's struggling to keep up with the him and the pace of the dance, this is just before she trips up the stairs and as others have said is noticeably out of step with the other girls and him at the top. So I think overall her marks were fair on this occasion.
https://www.youtube.com/watch?v=q-k2mcA9J-M