I'm pretty sure j.lk delay crossup j.mk still works.
Squigly has stronger ground mixups than air vortex imo. I think you would be missing out on a large portion of Squigly's strong points if you were primarily using her air setups!
If you are struggling with PW definitely check out Yaya vs Domo at NWM7. Yaya has a better handle on this matchup than anyone else. It's also a good reminder of how good Mortis is!
Against PW I just go ham with overheads and j.lp divekick shenanigans. In the corner I like to do launch j.mk > j.hp s.lp low/thow/high. I think she can still mash out of it but it does not look like something you can mash out of.