Hi Hannah, welcome to the board.
Although I cannot help with the id of your vase, I would like to mention:
Instead of "size around the middle" most of us prefer diameter ("size across the middle"). With a quick and approximate mental calculation, I guess it is just under 20cm.Your third image shows a different shape than the first, but my diameter calculation would suggest the first image gives the true shape.Could we please also see a photo of the base - bases are important in many id queriesIt is usually better to have a more descriptive title for a thread, but I have to admit that I would find it hard to come up with a brief yet meaningful title for this one - it's just so ... well ... colourful ;D