My gf keeps ghosting me

I am 17m and my gf does not talk to me all day n only like after 1am and i think that her interest is getting low because i gave it my best like i am not boring at alll but still n she was like MIA for 2 days n then she said that i had flu n fever but she didn’t even texted me that i am sick or something should i ask her that what’s going on?