My kids are 5 and 7 (almost). That is 24 x £100 birthday and Christmases. We have micro scooters, bikes, baby Annabelles, lego, billions of second hand books and toys, posh clothes and cheap clothes, a 3DS etc. I buy them annual memberships to local attractions. They save their pocket money (£1 a week) to buy presents for their eight grandparents (think divorce and adoption).
I don't know why I am trying to justify myself here. We are normal in the area where we live. We are very fortunate. We know this and are grateful. We support several charities.
They will spend £100 on her, I am asking for help towards them selecting a useful device that will serve her well for a few years. Them not spending it is not an option - I have tried that tack and the number of My little Ponies and talking electronic toys that they chose was, frankly, depressing.
Next year, she will probably need a bigger bike, so I won't get so much grief for that.