How to ask her out again after she didn't reply to my last plan suggestion

A plan is a bigger ask than a text. She has to decide whether she wants to meet you, check her schedule, and commit to a time, and all of that can get pushed down her list. People in active lives often leave a plan unanswered because they meant to reply and then the day got away from them. That is far more common than a clear no.

So read the silence as undecided rather than declined. Check how the conversation was going before the plan. If she was replying quickly and asking you questions, the silence is probably logistics. If replies were already slow and short, the silence is more likely a soft signal that she is not that into it. Either way, you do not yet know which one you are dealing with, and your next message should be built to find out without forcing it.

The first useful kind of follow-up is a light check-in that gives her an open door without repeating the plan. It mentions something from the conversation or the day, and it leaves the plan out of it or mentions it only in passing. Its job is to restart the thread and let her answer without pressure. A draft is this kind when it could be answered with a single word and the answer is fine either way. It should leave out any apology, any reference to her not replying, and any second version of the plan.

The second kind is a fresh plan with a looser shape. Instead of a specific night and place, offer a general window or two options, so she can pick one without having to propose her own. Its job is to lower the cost of saying yes. A draft is this kind when it gives her a choice rather than a demand. It should leave out any line that makes saying no feel awkward, such as "I really hope you can make it."

The third kind is a direct, unbothered question about whether she is still interested in meeting. Its job is to get a real answer. A draft is this kind when it is plain and light enough that a no does not sting. It should leave out any guilt, any mention of the earlier silence, and any sign that you are waiting anxiously for her reply.

Send the follow-up during the day, when she is likely to be awake and not scrolling in bed. A message at 2am reads as either desperate or flirting in a way that is hard to take back, and a message arriving in the middle of her workday is easy to answer with a quick yes or no. Aim for a time when you would be happy to see her reply, not when you most want to hear back.

Wait at least two or three days after the first plan before following up, and do not send more than one follow-up in a single week. If she answers, match her pace and keep the next step simple. If she does not answer after one follow-up, let it sit for a while, then decide whether you want to try once more with a different light check-in. If silence continues after that, stop. Taking the hint is not a loss, and continuing to chase someone who is not responding tends to make the rest of the conversation harder to revive later, even with someone else.