Ask her out on the app or keep messaging first

Watch for two things in the first few exchanges. First, is she asking you questions back, or just answering yours. Second, is she adding new information, or is she giving one-line replies.

If she's answering but not asking, she's still deciding. If her replies are short and don't invite further talk, she's not warmed up yet. When she asks you something unprompted, mentions a specific thing she likes or does, or shares something that took a bit of thought to type, she's moved from 'vetting' to 'engaged.' That's when it's safe to ask.

Your move is to reference something she just told you, acknowledge it shows you two could actually click, and then suggest meeting up. Don't make it a separate topic. If she mentioned she loves a certain kind of restaurant, you could say something like 'we should check out [place] sometime.' If she told you about a hobby and you also do it, you can tie that shared thing into the invite.

The goal is to make the ask feel like the next logical step in what you're already talking about, not like a script you're reading. Keep it short. You're not selling your entire personality yet. You're just saying 'I think we'd get along, let's actually meet.'

By the third or fourth exchange, you have enough signal to know if she's engaged. That's when you ask. Send it during the day when she's likely to see it and when she can actually think about saying yes.

After you ask, step back. Don't follow up immediately if she doesn't reply within an hour. Let her actually sit with the idea. If she's interested, she'll respond in the next day or two. If three days pass with no response, she's either not interested or distracted by other conversations. One follow-up message a few days later is fair. After that, you know where you stand.