They don't have a relationship. Giolla has a character trait of saying things like "Did you call me a fashion model?" or "Who are you calling Miss Universe?" when no one has said such thing. Basically, she hears compliments when they aren't there. The "Did you just call me Boa Hancock thing" is part of Giolla's character trait.
OT: Eh, it was a good chapter, but it wasn't personally my cup of tea. For how much I enjoyed it, I'd say a 3/5. But, it's written nicely and I'm glad Oda wrapped up Mansherry as well as giving us insight on her abilities and relationship with Leo all at once. He handled so much so well in one chapter, it's great. That last part was funny xD
It's pretty obvious Mansherry's powers are gonna be used on Bellamy, Luffy and Law. The question is will the latter two get it after their fight, or during their fight. I say the latter, they are getting pummeled, then restored back to full health and that's how they get the drop on Doffy.