Hi Mray,
I can second all that has been said by Ashley and Pearl_dreams but if you can afford it:
Go for the 8 - 9 mm size. This size is garantueed to fit your daughter over the years to come and once she gets older and since she is so tall, small pearls - and in a 7 - 8 mm there are perhaps only 4-5 pearls that do reach 8 mm, everything else is as small as 7 - 7,7 mm or something like that.
Studs can be slightly smaller, if dangles, 8 mm is nice too.
Just from a customer who has learned her pearl lessons over time.
