How to reply when she says my schedule is crazy, I'll let you know

Look at what she actually did. She didn't say no. She didn't say maybe next month. She said she'd let you know, which means she's keeping the option alive while she checks her own week. That's a good sign if she also mentioned something about the conversation, asked you a question back, or used a warm tone. It's a weaker sign if the reply was one flat line and she never asked you anything.

Also look at how the invite landed. If you asked for a specific night and she gave a vague answer, she may be busy, or she may want more reason before she commits. If you offered something low-stakes, like a coffee between errands, a vague answer is usually just logistics. Match your response to whichever is most likely, and don't assume the worst from one short message.

The reply you send should do two things. It should accept that her schedule is hard to pin down, and it should leave one easy path back to a plan. Think of it as lightly signalling that you're still interested while removing any sense that she owes you a date. A reply that shows you have your own week going on tends to read as confident rather than indifferent. It tells her the offer isn't resting on her alone.

Keep the message short and warm. Respond to something she actually said, like the busy week or the thanks, so the exchange still feels like a conversation. Avoid anything that asks her to commit in this message. The plan can come later, once she has a clearer picture of her calendar.

Give it a full day before you say anything else. If she's really busy, she may not look at her calendar again until the weekend, and a text on Tuesday night will feel like pressure. A realistic window is three to four days from her message, depending on how the week is going. Send the follow-up during daytime hours, not late at night, when it can read as either bored or lonely.

When you do check in, make it easy to answer. Mention something specific, like a place or a rough time, so she only has to say yes or pick a different day. If she replies warmly but still can't commit, try once more, then stop. If there's no answer after one follow-up, let it go. If she starts a conversation again later, reply to that.