So out came her sparkly dress and pretty clips, her dietary preferences were organised - chocolate ice cream was ordered - and her chariot was prepared: I cleaned the car.
We arrived on time, for once, to see life-size photos of a certain well-known boy band at the door, giving us a good feel for the evening ahead!
Smiley was a bit apprehensive at first. The faces looked familiar and the voices were friendly, but it had been a long time, so it was a while before she would look at anyone except me, and even longer before her famous smile began to appear. But once it did, there was no stopping her.
You see there's always a special welcome from the special needs community. First it was the parents, most of whom we haven't seen for a year or so, but they all came over, and they all said hello to both of us. And once we were on the dance floor, the other young people did too. They danced with her, and chatted to her, and she totally relaxed. There were none of her funny habits. No teeth grinding, no lip-licking. Everyone said how well she looked, a big relief after the mystery sickness that we had to deal with last month.
The party was due to end at midnight, but Smiley started to look a little glazed around the edges soon after 10. Time to go home. After all she still has to get up before 7 for school - but only for another 12 months. After that, who knows? Maybe she won't have such an early start, and will be able to stay up with her grown up friends. I see a lot more late nights in her future!
Of all my children it looks as though she is the one who got the party girl gene! Now I just need to reactivate mine....