She has a massive shield and protection bubble that can make spikes. She can float. She can control plants. She can heal almost anything. She's larger than the other gems (hard to tell if larger than Jasper?) and so probably a pretty powerful fighter.
If Steven is anything to go by she can also shapeshift and is telepathic (Steven has been jumping into people's bodies/dreams).
She somehow has a lion that's persisted after she's turned into Steven - it doesn't seem to be something normal for gems as the other gems didn't recognise him as something that could be a thing. This lion can move extra-dimensionally and has a weaponised roar.
What can the others do? They each have a weapon. Amethyst seems super gifted at shapeshifting. Garnet can see the future (Sapphire - cold powers + future vision, Ruby - hot powers only). Pearl has holograms. Peridot has magnetism. Lapis has a bit more at flying + waterbending + whatever mirror thing she has going on.
I feel like this show is too well thought out to just attach loads of powers to Rose without thinking it through. Also, Pearl was apparently 'hers' and was 'fancy' (though that might just be Pearl having grown into herself more than most pearls as she has her freedom).