My own sibling is 9, so around Isla’s age and at 5/6 years old she did indeed have a unicorn themed bedroom, pink with unicorn stickers and things everywhere, she started to grow out of it around 7 along with LOL dolls and now has a rainbow themed room with an ice big double bed (of course not saying Isla needs a double bed but you get the idea). Sibling was very happy about the ‘big grown up girls bed’ tho. (At 19 I still have a single lmao)