Struggle is real

Just friendly.
Don't act like anything might happen or you'll jinx it.
Fingers crossed she really likes you though.

Ask?

Same things go with girls
Is he just being polite and nice or he likes me?

Aaaaaaand that's why I'm single.

You have to know how friendly she usually is to have a basis of comparison. If she's being waaay nicer, then she could like you or might want something from you. If she's naturally friendly to everyone all the time, then it's harder to tell

Does she have a boyfriend? If not, ask her out. You'll get your answer