Yes the Angie Russel storyline was great and Kate really showed her chops defending Nick. It's a shame Jade was sort of thrown together with Seb as an afterthought when Nick left and Kirsty got back with Kane- I feel like the writers just didn't know what else to do with the two of them.
Her exit wasn't great either. Expelled from school, finding out she's not Kirsty's twin after all and doing drugs with Duncan? It just didn't line up with her character over the previous 4 years. At least she wasn't killed off though I guess.
I agree- her daughter is gorgeous and Kate hasn't aged a single day. In some of her husbands IG pics she still looks 18.