How to get her number when she says she's comfortable chatting here

She did not say no to giving her number. She said she is comfortable here at the moment, and she attached a time word to it. That is her telling you the pace is hers and that she has not decided how fast it moves. Read the rest of her messages too. If she is asking questions back, sharing details about her week, and replying with more than a word, the interest is real and the boundary is about process. If her replies are shrinking, the boundary may be doing more of the work than the interest is.

Look at what she picked up from what you said. People who are cautious about moving off-app often respond well to whatever made them feel safe in the first place, like specifics about who you are or a clear sense that you are not hurrying. A one-line answer to a question she asked is a stronger signal than a reflexive push for contact. Note whether she is engaging with your topics or steering away from them.

Once she has said she is staying on the app, your job is to make staying there feel good. That means answering what she asked, picking up a detail from her last message, and adding something of your own so the exchange moves both ways. Ask her a question that gives her room to talk, something about the thing she mentioned rather than a generic how's your day. Specific questions show you were paying attention, and paying attention is part of what makes a person trust you enough to share more.

Avoid turning every message into a bid for something else. If the chat is good, she will likely offer contact herself once she feels settled. Your reply should give her a reason to keep the thread alive, and nothing in it should suggest the thread is only a stepping stone.

After she sets the boundary, leave the number question alone for at least two or three days of normal chatting. Two days is a short window, so give it a full cycle where the conversation covers new ground, a plan or a shared joke, before you return to it. When you do come back to it, do it lightly and tie it to something she has since said, such as a plan you are both excited about or a topic you want to keep talking through. Keep it to one sentence and make it easy for her to say not yet again without it being awkward.

If she does not reply to a message that moves things forward, do not send a second one that repeats the ask. Let the thread sit. If a week passes with only one-word replies or no replies at all, that is your answer. Stop pursuing the number, and decide whether the conversation still holds interest for you on its own terms.