There are many topics to make a girl happy. The key is to understand her interests and preferences, and then choose the appropriate topic. Here are some common topics that make girls happy:
1. Talk about her hobbies: Understand her interests and hobbies, and then talk about these topics with her. For example, if she likes watching movies, you can talk to her about the movies she has watched recently, or recommend some good movies to her.
2. Talk about food: Most girls like to eat, so talking about food with her is always a good choice. You can ask her what food she likes, or recommend some delicious restaurants to her.
3. Talk about travel: Travel is a happy topic. You can talk to her about the places you have been, or Plan to go somewhere. You can also ask her if she likes to travel and where she most wants to go.
4. Talk about pets: If she likes pets, then talking about pets with her is always a good option. You can ask her what pets she likes, or share some interesting pet facts with her.
5. Talk about music: Music can make people relax and make people happy. You can ask her what kind of music she likes to listen to, or recommend some good songs to her.
6. Chatting about gossip: Girls usually like to gossip. You can chat with her about some entertainment industry gossip or interesting things around you.
7. Talk about cosmetics and skin care products: If she is interested in these, then talking to her about cosmetics and skin care products is also a good choice. You can ask her what brand she likes, or recommend some useful products to her.
Please note that different people have different interests and hobbies, so when chatting with her, be sure to observe her reaction and choose topics that interest her.