What makes you think so (maybe I missed something about it in the other chapters) ? It's clear that Louise hates her, she says it enough to Lena. But I think that Ivy simply doesn't give a damn about Louise. That's why she completely ignores her at the club, unless of course Lena warned Louise about Jeremy, then Louise goes straight at Ivy accusing her of stealing her boyfriend. Ivy can defend herself and tell Louise maybe what she needed to hear about him.
I agree that Louise gets humiliated and that it can make Lena's life more complicated (depending on how she handles her after
) , but it is just a consequence of Ivy going after Jeremy for payback (which has been her main goal all along). Ivy never had any intention of doing this to hurt / humiliate Louise, she just does not care about her and about the consequences.
And that string of events can be entirely avoided if :
- Lena does not warn Louise about Jeremy
- Ian is not with Alison at the club
--> Then Jeremy screw the whole thing up all alone, without needing any push from Ivy.