I don't post much, I prefer to read you, but I was wondering when will people notice that.
Indeed, whoever said that Sam and Snez are made of the same cloth are correct. Snezana's edit was quite telling how much they shielded her. It also helped that her relationship with Sam was focused on her being a mother. But there were signs of jealousy early on after her first date with Sam, only that it wasn't as prominent as it was with Heather and her flushed cheeks. I'm convinced she was reassured by Sam much more than anyone else - Sam admitted in one interview that there were things he said that weren't shown because it would be too obvious early on who he was falling for - and she never felt threatened by Nina, her friend or Heather, who everyone knew Sam wasn't into, so no wonder she was happy for them at the rose ceremonies, since they were just a number to fill the spot.
Of course she can say now that she keeps in touch with those 2 + another single mom Krystal (who lives far away), while Jacinda, Bec, Laura, Zilda, Emily, Sandra, Sarah, Ebru, Tessa, Joni and Lana (final 15 women) hang out together or are publicly showing their support to each other (and not much for Sam).
Even though I doubt she actually has any real friendship with Heather, because Heather herself is very outspoken who her friends are and who she is the closest to (Sarah, Tessa, Joni, Jacinda, Nina and Rachel from Adelaide) and she doesn't list Snezana among them.
I think Heather and Sarah are close to Lana as well, they seem to have built a genuine friendship to me. Sarah basically nommed Lana for the crown. I agree with your point completely