Hi my dd is 7 and just started riding lessons through Riding for the Disabled. She would like her own hat but given that she has grown hugely over the past few years will her head grow some more? I don't mind getting her a hat if it will last a year or so. The only place we have nearby is quite expensive and it won't get that much use. I did wonder about the adjustable ones but they seem to look quite cheap compared to others. Any advice? TIA