My girlfriend is distant

So I’m with this girl and we’ve not been together long but at the start off the relationship we were really like silly like she we would just like mess around but over the last few days she’s been rlly off w me an basically I’ve asked her what’s wrong and everything however when I ask she says it dm or like just says I’m fine. I’ve told her am always there for her an I love her but she gives me snotty replies like U2 or samee and as a girl I expect to know how to deal w it but I have no clue like I just wanna be there for her and she txted my best mate saying she doesn’t think I like her an this but I don’t know how much more obvious I can make it like I’m a very secretive person w my relationships like I hate goin out in public w someone am w but like it’s different w her like I wanna be out all the time w her an I always miss her I just don’t feel she feels the same way. Like I have no clue what to do please help?

Update:

I meet her yesterday and she was w her mate an we were sat there an she was fine then out off no where she just went really sad so I txted my mate asking wha to do an by the time we’d come to a conclusion she was fine again then she wanted my phone but obviously my mate was saying all this about how it’s nah fair tha she just goes in a mood an doesn’t tell me what’s wrong then so I didn’t give her my phone then she got in a moody w me an went an sat w her friends away from me then she said why do I always go for head fucks an at this point i fully just wanted to cry like I’ve made it so clear an I have my own stuff goin on as well an to hear tha just pushed me so I txted my mate an I said listen I need to leave now could u come meet me so I waited for her but by the time she arrived me and my girlfriend managed to sort it out then we were fine till I was on ft w her an I was w my brother an I was talking to him then next thing i know I was talking to her an I wasn’t getting a response so I looked at my phone expecting to see the paused screen cause she’s never on an she’d buttoned me so I called her back an she kept buttoning me so I txted her an she hadn’t spoken to me since l saw her (yesterday) an I just don’t know wha to do cause I like her so much