One possibility to consider is that the lasso may be... Well, not sentient, but capable of following directions and self propulsion. It does a lot to explain the physics not making sense, what with all the web swinging shenanigans, and why she could spin the lasso to deflect bullets when she was failing to do so with the bracers.

Kind of like how pre-Mother Storm Mjolnir functioned. The wielder has an almost telekinetic like control over it. In fact, the spinning lasso shield was pretty reminiscent of Thor's hammer spin as a shield move.

It also isn't much of a stretch given the level of absurd things the lasso does. Catching the jumbo jet and a lightning strike are easier to explain as the lasso being hella magic than physical movement on Diana's part.