I don't expect a huge arc or anything, I don't even expect her to be Ludo tier.
But Buff Frog got two episodes all to himself, and he's by no means a main character.
Jackie has a reason to worry about her situation, and she's justified in being a bit pissed at Marco prioritizing Star, no matter how justified he is as well. There has to be resolution because Jackie has been shown to be a good enough person to get something out of this.
Which is partly the reason why the Jackie situation is so heated; she's in an awkward middle area between being a complete blank slate who almost isn't human, and being a fully fleshed character you can invest in. She got enough appearances with Marco and we got enough insight into what she values in people that it would seem kind of shitty for her to get the shit end of the stick with little followup.