Confused feelings about a sister in my class - need advice, please

As-salamu alaykum. I'm a 20M and there's a Muslim sister in my class I really like. I’m feeling torn and could use some guidance. We never speak face-to-face in class or hang out, but we text for hours some days and then the next day she acts like I don’t exist. She often declines my calls and then texts me right after. At first I thought she wasn’t interested, so I stopped double-texting and stopped sending reels. I also stopped initiating messages to see if she would, and she actually does reach out now. Even when I give short replies, she sometimes makes more effort by messaging again or sending things. I can see a future with her - she’s beautiful, smart, and carries herself well. I don’t think she’s talking to other guys in class. We click when we talk online, but in person she’s very reserved and modest; she often wears hijab but not always, and she’s an immigrant from Saudi. I’m not sure whether she likes me or would feel uncomfortable if I made a move. I want to be honest: I want a relationship that could lead to marriage, and I don’t want anything inappropriate or haram between us. I just want us to get to know each other in a way that respects our faith until we’re ready for nikah. I’m worried she might reject me or think my approach is wrong. What’s the right way to handle this within Islamic guidelines? Should I try to get to know her family, speak to a wali, or approach her directly but respectfully? Any practical advice on how to proceed without causing discomfort or crossing boundaries would be really appreciated. JazakAllah khair.