It's both of them. For all the claims Zarina makes how she doesn't care about Ivy at all, she spends 90% of her time shitting on Ivy in some way and trying to drive a wedge between her and Lena and/or to get some dirt on Ivy. She's as fake and spiteful as she says Ivy is. It's one of these "takes one to know one" situations with a lot of projection and little more than that.
Also, i'm really not buying the excuses how self-appointed makeup expert was genuinely thinking she's doing Lena a favor by painting her like a clown, potentially right before important photo session.