Despite her dad and I being together for nearly five years, I just don’t know her that well (a long story but we are trying!) and am struggling for ideas. I don’t have kids myself so I am even more clueless 
I know it’ll depend on the child, but do you have any recommendations that are fairly generic for a 13 yo girl? She seems to spend a lot of time on her tablet or laptop but I know she likes her dance classes that she goes to each week, chocolate (obviously!) and also enjoys cooking. She mentioned Lush! but I think her gran is getting her a voucher for there. That would be the sort of thing I’d go for, or maybe a hoodie or something if I knew what was “cool”! Trying to get her to actually leave the house appears to be a mammoth task, so I don’t think an “experience” or day-out type of thing would go down that well!