A female classmate gave me a sentence "Love is zero ice, friendship is zero water, maybe we are the best mixture of ice and water".

Hehe, ignore what she said, ignore her,

As you said, how can you say whatever you want in interpersonal communication?

And even if something really happened to her, what she said was only her ideal state.

It is impossible not to contact you.

In the meantime, you can keep texting her. Trust me, it doesn't matter.

About her short message: love is zero ice, friendship is zero water, maybe we are the best mixture of ice and water.

What is ice-water mixture?

Both,

There is love and friendship,

As for this ice-water mixture, how will it develop, whether it will become love or melt into friendship,

It all depends on your next contact,

Let's see which direction you go in your continued contact.

But there's a good foundation, isn't there?

I think what she said to you is a hint to some extent.

At least, she admits that your relationship has "ice".

Come on, I wish you all the best.