Its giant crusher i think

Nah looks like marika or maybe torrent owner.

Miquella suffers from eternal youth and is as such a tiny kid.
This is most likely Marika.

Miquella as a kid is probably almost the size of a normal human. So the size argument is pretty weak to be honest.

Vaati got wrong every single details of the lore of this game, he literally didn't do even a single correct assumption with his poorly thought speculations lmao

Marika is a numen, she is huge, much bigger than Torrent.

There is lore that points to the fact that Miquella had 2 forms

Miquella has an androgynous appearance in all official art, with very long braided hair and an elfin face. There's also speculation that Miquella and St Trina are the same person (Sekiro Dubi has done a lot on this), and the description on St Trina's sword says that people aren't sure if St Trina is male or female. The feminine-looking person on Torrent could definitely be Miquella, all grown up after years of being imprisoned by Mohg.

Miquella isn't small either. Compared to Morgott, he should be around Tarnished high.

Womans legs? Legs are just legs fool lmao