What to text back when she says that sounds fun but I'd rather do something low key

When someone says they would rather do something low key, the most common reason is energy, not interest. She may have had a long week, she may not want to get dressed up on a weeknight, or she may simply find loud spaces draining. Those reasons have nothing to do with how she feels about you. Read her message as a description of the kind of time she wants to have. The words "honestly" and "not really a big bar person" in an example like this usually mean she is being candid, which is a good sign. People rarely explain themselves this much when they are trying to get out of something.

Check whether she has also said anything about the plan itself. If she said the idea sounds fun, the interest is there. If she only said "I'd rather not," the signal is weaker and you should keep the next suggestion smaller and cheaper. Either way, the fact that she named an alternative tells you she wants to see you. Someone who wanted to disappear would just stop replying.

Once she has named a preference, the best move is to offer one concrete smaller option, not a menu. Something like a walk, coffee somewhere calm, or cooking together works because it matches what she just described. Make it specific enough that she only has to say yes or no. Vague suggestions like "we should hang out somewhere chill" hand the planning back to her, and when someone has just told you what they want, they often do not want to do the planning too.

Keep the timing and the commitment light. A short coffee or an hour walk is easier to agree to than a full evening, and it also gives you something to build on if it goes well. Acknowledge what she said in a few words so she knows you heard it, then move straight to the new idea. The reply should feel like a small adjustment to the plan, not a retreat from it.

Give her a normal amount of time to answer, usually a few hours in the day and no more than a day overnight. She may be busy, and a quick answer is not required for her to still be interested. If she replies with a yes or a time, great. Lock it in with a specific day and place so it does not drift.

If she goes quiet after a reasonable gap, send one short follow-up that is easy to answer, such as asking whether this week or next works better. If that also gets no reply, stop. Do not send a third message or a sulky check-in. A second flat non-answer is a clear enough signal, and you will save yourself a lot of overthinking. If she does reply later with something warm, you can pick it back up without making it a thing.