Option one: Lucretia genuinely couldn’t come help Davenport in the liveshow because she was busy repairing Neverwinter
Option two: Lucretia could have come, but she knew Taako would be there and didn’t want to make him uncomfortable, and she is also nervous about spending time with Davenport after what she did to him, so she abstained
Option three: Lucretia got an invitation to spend several days on the open ocean with those three chucklefucks and immediately grabbed an excuse out of midair to avoid it. ‘Sorry, I’d love to, but I’ve got to… fix a city. A whole city. All by myself. It’s unavoidable. Have fun with your ghost pirates. Break some legs. Ideally not yours.’