Turned out I had a little more time: I don't personally even like coffee, so if she doesn't either that would be awesome. I'm a tea drinker.
Actually here in Sweden we have the famous "fika" which is basically just meeting somewhere out and having, typically, a bit of coffee and some kind of pastry and talking a bit. A fika can be between friends or as a date. I feel it's the proper level in any case, dinner is way more serious stuff.
EDIT: Forgot to add, she's a nurse at the sleep apnea clinic. I only met her last time and I thought we got a bit of a connection. At least I found her mesmerizing. So there's the ethical bit of her being my nurse, but it's not like she done a complete physical on me. She's helped with the programming of my CPAP machine. I'm going in tomorrow to have it reprogrammed a bit.