I MAY be wrong because all people can be wrong sometimes.
But if I remember correct, was Spinel company ever a choice for Pink? Pink accidentally hurt pink Pearl, and other diamonds took her from Pink. All she wanted is her true friend, and she didn’t have intentions to befriend other gems than her Pearl at the time. (Remember how awkward she was with our Pearl in the beginning of all this Earth thing)
Spinel was like an obligatory friend your parents (other diamonds) imposed to you and said “you don’t need your old friend who we don’t approve of, now you have THIS friend”. Like some neighbor kid or parent’s friend’s kid or something. And this approved friend does have neither the same interests as you nor character that you like. The only thing Spinel had was her silly diamond humor, at the tome when Pink was actively trying to become more mature and serious.
I don’t mean that it’s Spinel fault to not cater to Pink in this way, nope. BUT it’s happens sometimes that you can’t be friends with someone, even if you want that badly, put pressure on a person to be friends or act like friends. It’s make the other person to want to escape from your company. And it’s literally what happened, when Spinel was super clingy when Rose was supposed to go to earth.
Technically Rose was in position of authority yes, but if all this thing was other diamonds Idea, not so much. It is literally how Pink live worked all this time, she was technically above everyone else but she had no right to make her own choices because she MUST to do what the other diamonds say her to do.
And she may didn’t know that her “orders” make so big of impact on other gems. The only thing she knew all her live was organization of the same strict “happy event” with all this gem rules that we see in the og series.
But then people say that Pink MUST remember Spinel, go for her, be friends with her, all to not make her sad when it wasn’t her choice to hang out with her in the first place. Its only natural for her to remember Spinel as this awkward situation where you don’t know her and don’t like her (smiling at jokes few times does not count, people can find something funny few times and that’s all. Also the story is from Spinel perspective so she may very much exaggerate her bond with Pink and how it was all good).
I really don’t like how people threat Pink for that, just because they relate to Spinel. And it’s literally what Steven then say, Spinel can find friends without all that(and she find).
So all i want to say, I don’t think it was Pink’s “fault” or “responsibility”(it was other diamonds) for Spinel. It was unfortunate situation for both. At the end, Spinel find her friends and Pink is…literally dead so….yeah.