It's simple, she doesn't has elemental ninjutsus because she specializes in mostly medical stuffs and also Yin Seal jutsus.
Take a look at Kabuto who is a medic, in Part 1 and in early Part 2, we usually saw him only using chakra scalpel (sharpen your hand into a "blade" with chakra) to attack. We should have expected to see some kind of offensive elemental ninjutsus from him but it seems like he didn't learn them, even though he was a very grown up adult very much older than Sakura.
Also, other K11 members specializes too. Shikamaru specializes in his clan shadow jutsus. Ino with her clan jutsus. Choji, Kiba, Shino, generally everybody has their own specialization. Hyuugas focus on their taijutsu techniques.
Sakura's ninjutsus are basically the following:
- Medical ninjutsus
- Chakra scalpel
- Chakra enhanced strength
- Kuchiyose no Jutsu
- Remote Healing
- Yin Seal
- Souzou Saisei
- Byakugou no Jutsu