I don't think Amber was defending Mark she was basically saying they are all adults. She's not responsible for his behaviour.
I'm not surprised she's still off with Jessica. I would be too (I hold grudges). I personally think Amber has grown alot since the series.
Yeah I agree re Jessica and Amber, there's kind of no coming back from that really, she cracked on to Barnett while he was engaged to Amber and I don't think you would ever get past that tbh. It was more Amber's behaviour towards LC tbh. She seemed so smug and unsympathetic, just shrugging and saying "
tit happens", and when Diamond tried to point out that there's no way Amber would have been cool with it in LC's position it felt like she just couldn't wait to rub her nose in it that "my situation is different because we're MARRIED, DO YOU UNDERSTAND THAT? I'M MARRIED" Etc. I genuinely feel that if it had been any other cast member, not one who was a former love rival for Barnett, she would have been much nicer about it.
I'm really not sure what signs you've seen of Amber having grown up a lot. She still seems exactly the same as before to me tbh. Even the idea of having a baby, she doesn't even to recognise there is some validity in her husband's view that doing that whilst you're living in a flat with a room mate is selfish and inconsiderate to that room mate?! She cant see beyond her wants and her needs. I still think a lot of their relationship is based on lust rather than actual real meaningful love, they just don't seem in tune on some fairly key issues.