oh no
"hii! i've started noticing you've been acting a bit differently recently, can i ask if i did anything wrong or if you're doing alright? Sorry if this is just me overthinking 😭 but if something's bothering you and there's anyway I could help pls lmk! :)"
Obv change that to your tone of texting, but it sounds like sthm like that would help. It treats the person with kindness cuz you don't know what's happening with her, and it helps you figure out what's going on. How she responds chooses how you want to move it further and if she's someone you want to keep in your life or not, but I'd wanna be as nice as possible until I know whats happening