Probably, unless she's going to be out of town, she isn't booked up much more than a full week in advance. But if she can't accommodate you, you'll have time to schedule your second choice.

Also, once you know generally where you'll be, where her incall is, you can choose a nice restaurant in the area. You might even want to swing by one evening for dinner alone just so you can sample the menu. Good chance you can find the menu and all the info you need online, though, so play that by ear.

I suggest you book at least four hours--that's the usual dinner date package most girls offer--and there are two ways that can go. You might meet her in her incall for a bit of playtime, then go to dinner, or you might take her to dinner first and have the opportunity to fantasize about what the rest of the evening will be like over dinner.