i mean they do interact but zoe totally ignores her most of the time on ig at least.
their dynamic is a bit off and i think zoe just thrives off of being the most prettiest with the longest hair in any situation that she is, so she kinda gives off this "iam better than her" vibes
iam sure some other people have proofs or better examples but thats just my take
Yeah I think Zoe seems like she thinks she's better than Dianne, and comes across a bit patronising, and Dianne seems to try really really hard to be part of the family. Things like when it was Diannes bday they just got her flowers a few days late, and Zoe pretended to forget which day the birthday was actually on, even though its the same day as her grandads. But Dianne baked Zoe a cake for her birthday.
However, I fully think that Dianne would be invited to the 'not a baby shower, baby shower' because Zoe has to at least keep up appreances that she likes Dianne, but also it's not like Zoe has many people to invite so she needs more people to attend.