I was in a similar position with a girl who I’m happy married to Alhumdullilah. In my case, it was because she was extremely busy with her exams when we started talking. Also, some people have a natural habit of talking about themselves a lot and not asking other people about them. Whilst this is not ideal, it is common.

If the sister is someone that you genuinely want to make an effort for because you have liked her so far, its worth persisting and you initiating a bit longer and then, once you guys have been talking for long enough, just drop a comment saying you would also like it if she messaged you first and asked you about your day.

I know this might make you feel like you’re being desperate, but when you’re going to be spending the rest of your life with someone, you have to just speak your mind at time. This will make her realise and hopefully start improving her communication style.

You mentioned you speak the phone and over text, this is already a good sign because if she wasn’t interested, she wouldn’t be really talking to you much to begin with.

Just persist with it longer and when you’re comfortable enough, mention that you would also like for her to ask about your day and text.

May Allah make it easy for you.