12 and 13 is a difficult age, because the girl certainly no longer feels like a child, but is still a long way from adulthood. A girl of this age wants to be especially honoured on her birthday and feel like a young adult. What her friends think of her is the most important thing for her. So you need to find activities for her birthday party that will excite young teenagers but can still be carefully supervised.

Many almost teenage girls are interested in things they see young women doing. To make the birthday girl feel like a young lady, you can take her and her friends out to a good restaurant or buy them concert tickets for their favourite band. Another option is a day at the beauty parlour or wellness salon for the birthday girl and her best friend.

If you are planning a birthday party with boys and girls, you should make sure that the genders are balanced. The girl should have a say in her own birthday party and say whether she wants a dance party in the evening or a coffee party in the afternoon. She herself should be involved in the preparations. The aim of the parents is to give the party, to be present but still appear invisible so that the young people no longer feel like children. 

12 and 13 years is a good age for outdoor activities. Amusement parks, sporting events or swimming pools are good choices if the season allows. They might even enjoy a simple picnic in the woods, not forgetting a birthday cake.

Girls want to feel that their friends and family like them, so a surprise party is often a good choice. This could be discussed and planned with the friends and they could be encouraged to help. Parents should do most of the planning and make sure everything runs smoothly, but otherwise prefer to stay in the background. This is a special day for the birthday child. She is the main character and this is the day she begins to celebrate her independence.