#at the end cosmos does say she wanted to guide usagi to make the 'right choice' at the cauldron but

[charmtale]

before everyone gets sent to the middle of the galaxy*, we don’t see chibichibi do that much that could be described as interference with the past timeline but one thing she does do- the first thing she does at all- is rescue kakyuu. it's at least implied that kakyuu would have died otherwise- she even tells the starlights "Several times I tried to go to you. But my body's recovery took longer than expected... ChibiChibi was the one who helped me a lot." ultimately kakyuu helps usagi get to the galaxy cauldron, meaning her presence isn't inconsequential.

chibichibi also attempts to prevent the starlights from meeting kakyuu. she refuses when they ask and also did not at any point bring kakyuu's incense jail to them. now she obviously didn't feel that strongly about preventing it, she could blow up the starlights if she wanted, but i don't think she would've initially been against it for zero reason. and there is no way she doesn't already know their relationship even if you ignore that chibichibi is sailor moon from the future because she's been regularly talking with kakyuu about the starlights over the past few weeks or so.

this leaves me with some questions:

-what happens in the ‘first’ timeline that chibichibi/sailor cosmos originated from? mainly, does kakyuu live or die in that timeline? we don't actually know for sure despite the implication. does she live, but in a worse/damaged state? if she did die, how does chibichibi know her at all- hearing about her from the 'first' timeline starlights?

-why try to keep kakyuu from the starlights? attempted damage control to prevent the timeline from getting too different?

-if chibichibi’s interference caused kakyuu to live when she originally died, why do this? did she want someone to temporarily keep usagi company after all her friends died? did she just feel bad for kakyuu? did she know having kakyuu alive would get them to the galaxy cauldron more efficiently? clearly sailor moon got there one way or another in the ‘first’ timeline, and kakyuu implies that her star system (and by extension herself, as a princess) is just one of many that are all less powerful than our solar system, meaning she likely doesn’t possess the unique ability to travel there. it seems she just CAN help usagi get there because she knows where it is. but chibichibi herself could fulfill that role. so kakyuu is not necessary to get to the galaxy cauldron. therefore...?

i don't have answers. maybe to her it's like a videogame she's playing for the second time and she's like Ok This time i will see what happens if kakyuu lives. maybe she genuinely didn't know/forgot who kakyuu was and found her on the side of the road and was like 'well i might as well help this random passed out cosplayer while i'm here' and then it was thee alien princess and she was like I can't kill her now it'd be awkwarddddd. intergalactic toddler of mystery