Hi Ollie!
Here’s the thing with pointe shoes: they are very personal and often fitted for the best fit! If your girlfriend likes the brand and type, it would be best to buy her the same ones. Thats pounds right? 200 pounds can usually buy a few pairs so if you’re looking to buy just one pair, you’ll have plenty left over! I would try to check out her brand and size when shes not looking and of course, save the receipt in case it turns out she wants a different brand! Thats always a safe bet :) you can also always get her some accessories, a skirt, or maybe some leg warmers to go along with them if you wanting to spend more. hope that helps!