Personally, I tend to leave it and move on to BHS. Too many BWO isn't good for the back.
As long as the shoulder flexibility is there it should come in time.
Although just check- I had one little one, who wasn't flexible to start, end up in the same situation. Turned out when she learned kickovers, because she was strong but not really flexible on either leg, she randomly picked a leg- so learned to kick over with her left leg in the air.
When it came to BWO nearly being there for months a year or so later (at nearly 8), with flexibility much improved, we figured out her favoured leg was actually her right leg, so she was standing with her right leg in the air for BWO, getting as far as bridge, and couldn't get over as she'd never kicked over right leg first. I think we're going to have to go right back to kickovers and relearn the other way. Meantime she has BHS and ROBHS so it's not holding her back.