There’s a good chance that she likes you too based on what you said, that she replies quickly to your texts and is sometimes sweet.
I’ve known a lot of people who started developing feelings for each other through frequent texting, since it’s also a way of communicating and showing care when you often message someone.
Just let the two of you get to know each other more first and then confess your feelings when you’re sure you really like her. Then you can see how she responds.