She asked for your Instagram.

Handing it over ends the part where she is curious. Your profile answers the questions she was going to ask, you become one account among the hundreds she scrolls past, and something happening between two people turns into something she checks. None of that is a disaster. It is a trade, and it is a poor one this early. Declining is fine as long as it stays light, and it works by pointing at something better rather than withholding something.

In the first few messages

This is the case the example is for. She knows almost nothing about you, and your profile would answer everything at once. A playful not-yet that points at meeting keeps the curiosity where it does the most work, in the conversation. Keep it to one line and carry on talking as if nothing was refused.

While you are planning to meet

Now the request often means something else: she wants to check that you are a real person before she meets a stranger. That is a reasonable safety step, not a test. Send it, or offer a two-minute video call instead, in a few words and without protest. A joke here reads as a dodge.

After you have met

Swap them. You have already done the thing the profile was standing in for, so withholding it now reads as odd rather than confident. Exchange handles the way you would with anyone you have spent an evening with, and keep the actual conversation in messages, not in story replies.

She asks a second time

Give it to her. The playful refusal works once. Repeating it turns charm into withholding and makes the profile seem more important than it is. Send it without commentary and steer the conversation back to meeting.

Low, but a flat no is not the same as a playful one. Refusing with nothing offered in its place reads as secretive, and that is a worse impression than the profile would have made.

She laughs and keeps talking

The line did its job. Keep the conversation going, and do not return to the Instagram question. If you used a line that put meeting into the conversation, follow it up within a few messages with something concrete, while the idea is still fresh.

She says she just wants to check you are real

That is her safety, and it is met in a few words. Send the handle or offer a short video call, without protest and without a joke at her expense. Someone careful about meeting strangers is not testing you, and treating her like she is ends the conversation.

She asks again

She wants it, plainly. Send it with no further bit. The first refusal set the tone, and a second one only makes you look like you are hiding something that is almost certainly not interesting enough to hide.

She goes quiet

She was collecting followers rather than dates, or the line landed wrong for her. Either way there is nothing to repair. Do not send the handle afterwards as a peace offering, because it rewards the silence and turns your answer into a negotiation.

What should I say when a girl asks for my Instagram right away?

Something light that says not yet and points at meeting instead, like the chef and the fridge above. Keep it to one line and keep the conversation going straight after it.

How do I politely refuse to give my IG on a dating app?

Make it playful and offer something better in its place, usually the idea of meeting. A flat no or a fake excuse reads as secretive. A joke that implies dinner reads as confident.

Is it a test when she asks for my Instagram early on?

Sometimes. More often it is curiosity, a quick way to learn about you without spending messages on it. Treat it lightly either way. You do not need to pass anything, only to keep the conversation the more interesting option.

What if she wants my Instagram to make sure I'm not a catfish?

Then send it, or offer a short video call. Checking that a match is real before meeting is a sensible safety step, and meeting it without fuss is part of being someone worth meeting.

Should I ask for her Instagram instead?

No. If you want to keep in touch outside the app, ask for her number when the conversation has earned it. A number leads to a date, while an Instagram follow usually leads to watching each other's stories.

Is it a good sign when she asks for my Instagram?

It means she is curious, which is better than nothing. Whether it is interest shows in what she does next: someone interested keeps the conversation going and says yes to plans, while someone collecting follows goes quiet once she has one.

Is it different if she asks for my Snapchat or TikTok?

Not much. Any handle swaps a conversation for a feed, and early on the conversation is worth more. Snapchat is the partial exception: it is built for messaging, so if things are already going well and she suggests it, moving there can be a step toward meeting rather than away from it.