Sizing Help

[Shane4XC]

I’m looking to purchase a bike for my partner and she’s around 5’7. Looking at a particular bike, the store page recommends 5’8-5’10. However, it lists the attached geometry.

Since the top tube is listed as 520mm, this would actually be a 52cm frame correct? Which I imagine could be closer to her fit.

Are there any measurements we should take of her to see if they line up with the geometry of the bike?