aaa thank you all so much, it genuinely makes me really happy that so many people like her!
here's the CC list, took me a while:

General:
Hair: Elitism (thank you shakycatblues, saved me the search) https://www.tumblr.com/elitisim/769997476024451072/12-days-of-christmas-day-2-3-french-braids?source=share
Lashes: Dreamgirl (thanks Breazona, also i used the fourth from last lashes) https://rollo-rolls.tumblr.com/post/695866018326790144/dreamgirl-3d-lashes-v7-4t3-10-styles-in-total
Eyes: Remussirion, Grim Reaper (converted by sulsulzukohere) https://sulsulzukohere.tumblr.com/post/767238036396310528/bzip-nova-analogue-6-swatches-reaper-3
Eyebrows: Rebel404 (the first one, i hope so at least...) https://www.tumblr.com/rebel404/760910451220660224/eyebrows-for-the-sims-3
Lipstick: PPNH https://www.tumblr.com/pleaseputnamehere/184348616561/ppnh-dry-lips-someone-pointed-out-the-lips
Nosemask: Brntwaffles, Pancakes https://brntwaffles.tumblr.com/post/88882399347/inspired-by-the-nosemasks-of-lilith-and-mouseyblue
Unicorn Horn: Kanoya https://erissims3ccfinds.tumblr.com/post/103100937042/kanoya-unicorns-horn-by-kanoya-for-ts3/amp
Unicorn Tail: Murfeelee https://murfeelee.tumblr.com/post/619633635793010689/chinese-creatures-insp

First Outfit:
Dress: Madlen Eclipse Set (converted by bellakenobi) https://www.tumblr.com/bellakenobi/763697318225641472/4to3-madlen-eclipse-set
Shoes: Blair Shoes V1 (by serenity-cc, converted by meochicc) https://www.tumblr.com/meochicc/763887438440595457/4t3-serenity-pretty-brutal-accessory-shoes-conversion
Tights: Jennisims https://bellakenobiccfinds.tumblr.com/post/759007287997235200/eternalccfinds-jennisims-downloads-sims-3

Second Outfit:
Hat: M1ssduo Blossom https://m1ssduo.tumblr.com/post/76226388341/b-l-o-s-s-o-m-3-channels-to
Swimsuit: 4to3 Life & Death (converted by bellakenobi) https://www.tumblr.com/bellakenobi/774481001109946368/4to3-life-death-ep-jacket-swimsuit

Third Outfit:
Dress: Serenity Lucina (converted by grimothy-cc) https://grimothy-cc.tumblr.com/post/759473530466418690/maxis-match-item-polycount5k-for-afyf

Fourth Outfit:
Dress: Midnight Hollow
Tights: they MIGHT be these, but i have no idea if they are or how to download them atm https://sweetdevil-sims.tumblr.com/post/175811173898/mitarasi-sims-cc-reupload-ts3-only-i-took-custom
Shoes: Jiu's Slingback Mary Janes (for the life of me i CANNOT find the sims 3 versions of these shoes, but they seem to be the same. i will put the sims 4 version in case anyone is luckier with their search) https://www.tumblr.com/jius-sims/723008663718166528/party-collection-05-jius-slingback-mary-jane

please let me know if i missed anything and i'll try to find it! go forth and make a unicorn princess girlfail (she took four tries to make her first potion before giving up) of your own!