It’s long-established established canon that Leia is force-sensitive (Luke outright says as much in TLJ), and that force-pulling can be done without training (though I’m sure she picked some things up from Luke over the years). If Leia using the force caught you off-guard I’m sorry but like that was like my first expectation when I heard Leia would be in the sequels.
Also it’s so strange to me that people say it looked like Mary Poppins to them. have you never watched video of people in microgravity? it was honestly a pretty realistic depiction of how things behave in vacuum and zero-g, and I found the scene breathtaking.