If anyone should bear a grudge and not be speaking, it should be Renata, after the way she's been treated. Now they haven't been together much since Tereza left, and I don't meticulously follow them around to check out the vibes, so I might have missed some stimulating conversation...but from what I've seen, it's been Renata who's been trying to chat and be friendly, although she has been talking on her phone quite a lot. Maybe that's what's pissing the other 2 off...Renata doesn't need them, she has other friends, is doing her own thing and is happy and enjoying herself without them...
To be honest, if this senario is correct, IMO, Sher and Regina are worse than Tereza. At least Teriza showed us from pretty much day 1 that she didn't really like Renata, and hasn't been 2 faced...the other 2, however, have shit on her big style...