What should I do ?

Hi!
So I have a really good friend with who I talked about very personal and deep things. We talked a lot with each other, we're in the same university, and were really close. We met in september and she's leaving France for one year because our third year is abroad, she's one year ahead of me.
The thing is that since like 4 months we're less talking than before but it's normal I guess that at some point you have to slow down because you've already talked about a lot of things. So she doesn't answer my text for like one day even though I know that she's active and stuff like these. It's really frustrating because I feeli like I like her more than she does. I never resented her for not replying quickly, I totally understand the problem isn't there.
It's more that since she doesn't show me that she want to talk with me it's making me feel sad and I have less confidence in myself :/

So I was wondering if, according to you, it would be better to just stop messaging her, like, not stop answering but stop starting a conversation because if I'm always the one making the first step then it's meaningless. Or should I just continue ? Because when we're talking together it's really cool.

That's a hard choice to make for me because she really helped me a lot when I was in trouble and so did I so cutting of ties with her sounds weird but at the same time she's really making me feel sad :/ I already talked of it with her one time and in the end we didn't have time to see each other to talk in real life so she kinda forgot and we didn't go deeper and I don't want to suddenly bring that up. And since both of us are in isolation I'm probably not gonna see her before next year so I just don't know what to do...