Should I

Hey I've liked this new girl at my school l've had a crush for 4 months and l've been getting to know her and stuff I have her snap and number but sometimes she leaves me on delivered for ages and texts unenthusiastic and since today was the last day of term I shot her a message just saying "see you next term" at 2:40 and replied at 3:28 later with "ya" I mean she's great in person but I saw that if a girl doesn't like you she won't respond quickly and I've been trying to see if she's sending any kind of hints but I can't think of one and I don't know if she already has a boyfriend and since I'm going on holiday I thought I would just tell her that I liked her I don't know