Why is my cat frisky?

Are you still keeping her in a cage? Because if you were, which you shouldn’t be, that would explain why she is frisky.

If not, then it’s likely she’s just feeling more playful than usual.

it possible could be she is feeling pains of pregnacy like humans do,so she might be acting out

The cat is frisky because she is a having hormone imbalance due to her being pregnant. Please do not listen to what MeowMilk was talking about, they do not know anything. It is normal for your cat to do this. Find something for her to chase, and she will get all her energy out and then she will be a lot calmer.