Is it weird to text her if she takes forever to text back?

Start with what she sent last. A slow reply that is warm, has a question in it, or refers to something you said usually comes from someone who is busy but interested. A slow reply that is one word, or that answers your question and stops, often means the conversation has lost her attention. Then look at the pattern. If she used to reply within a few hours and now takes two days, something changed, possibly her schedule. If she has always been slow, the gap is just her style, and you should match it instead of reading it as rejection.

Check whether a plan is on the table. Someone who suggested a date and then went quiet is in a different spot from someone who was chatting casually. Plans make silence more noticeable, and they also make a direct question easier to ask.

When she comes back after a long gap, the first message does most of the work. Keep it short enough that she can reply from her phone while standing in line. Mention one specific thing from your last exchange so she knows you are picking up the same thread, not starting over. Then give her a choice she can make quickly, like picking between two options or agreeing to a time. A question with no clear answer, like asking how her week went, gets pushed to later and then forgotten.

Avoid anything that asks her to justify the gap. Even a light joke about her disappearing puts her on the defensive and makes her feel she owes you an explanation. Let her decide whether to explain. Most people who were busy will mention it on their own.

Pick a window based on her normal pace, not your anxiety. If she usually replies within a day, give it two days before you send anything else. If she is a slow replier, give it about a week. Sending a second message early reads as pressure, even when it is only a friendly check-in.

When you do follow up, keep it lighter than the first one. If that also goes unanswered, let the thread rest. One unanswered follow-up is normal. Two in a row with no reply usually means she is not picking it up, and a third message will not change that. Stop there, and if she comes back later, reply to what she sent instead of picking up the old thread.