Is she interested or just using me for attention

A person using you for attention will reply fast sometimes and slow other times, depending on what else is happening in their day. When they're bored, you get a response in ten minutes. When they're with someone else or busy, you wait hours or days. Interested people don't do that. They might be slow to reply consistently, but the gaps don't swing wildly.

Also watch whether she ever texts first. Not constantly, but occasionally. If you've been messaging for weeks and every single text is a response to something you started, that's data. She's not thinking about you between conversations. Interested people reach out unprompted because something reminded them of you or they want to know what you're up to.

When someone is using you for attention, the dynamic works because you keep feeding it. You text, she responds when convenient, you text again, repeat. Breaking that means you stop initiating for a bit and you stop asking questions that make her job easy. You're not being mean. You're just removing the reward for low effort.

A good reply here is short and doesn't require much from her. If she's interested, she'll recognize that you're not chasing and she'll adjust. If she's using you, she'll either disappear or only text when she needs something. Either way, you get your answer faster than if you keep playing the game.

Don't change your whole approach based on a single slow reply. Give it a week of normal conversation rhythm to see the pattern. Send your message, wait three to four days without texting again, and watch what she does. If she comes back with effort and asks about you, the slow reply was probably circumstance. If she ghosts or only texts to ask a favor, you have your answer.

Once you see the pattern twice, stop waiting for exceptions. People who want you make time. If she keeps choosing other things over responding to you, accept that and move your energy elsewhere. Waiting longer doesn't change her mind. It just wastes your weeks.