How to reply when she says she might be around this weekend

Notice what she actually gave you. She named a day, a rough time window, and the reason it might change. That's a person thinking about you and checking her calendar at the same time. The condition matters too. A sister moving house is a real obligation, not an excuse, so treat it as a fact about her week rather than a sign she's losing interest.

One message like this rarely tells you how she feels. It tells you she's willing to meet, with a few open variables. Your job in the reply is to be easy to say yes to once those variables settle, without making her feel you need certainty today.

Give her a reason to come back to it. Pick up the one detail she mentioned, like the Saturday afternoon window or the Thursday update, and attach the plan to it. If you name a backup, keep it light. A coffee, a walk, or a drink that fits inside the same window works better than a big dinner. That way, however her Saturday goes, there's an obvious next step.

Don't stack questions. One thing to answer is easier than three. A message that ends with a single easy decision for her, rather than a menu of options, usually gets a reply within a day.

If she said she'd know by Thursday, give her until Thursday before you read anything into the quiet. People often say "might know by Thursday" and then forget until Thursday evening, when they remember and reply. Checking your phone every hour in the meantime doesn't speed that up.

When Thursday passes with nothing, send one short follow-up that assumes the plan is still alive but asks nothing heavy. Something like a quick check on whether Saturday is still on, with a fallback if it isn't. If she still doesn't answer after that, the plan has quietly died. Let it go and don't send a third message asking why.