Ask her out to that sushi spot she mentioned

Most people don't volunteer specific details about where they like to eat unless they're thinking about going there. She's not just making conversation. She's showing you a part of her life and indirectly telling you where she'd be comfortable meeting up. When someone says "I go there once a month," she's also signaling she's a regular, which means she trusts the place and knows how to enjoy it. That comfort matters because she'll be more relaxed on a date at a spot she already loves.

Your message needs to do two things. First, acknowledge the specific restaurant she named so she knows you were listening and this isn't a generic ask. Second, suggest an actual date and time, not "sometime." Pick a night in the next week or two and say it. This removes her need to negotiate or figure out logistics. She can say yes or tell you a different night works better. If you're vague, she has to either start the planning conversation herself or assume you weren't serious.

The longer you wait after she mentions the restaurant, the more the moment dissolves. If she says it on Tuesday, send your invitation Tuesday night or Wednesday morning while the topic is still fresh in both your heads. If you let three days pass, it starts to feel like an afterthought. Fast timing also signals you were interested in what she said and you thought about it right away. If she doesn't respond within 48 hours, don't send a second message. Wait a few days and move on or try a different approach.