Cool dude. Just as a preamble, here's the mentality you have to have, or at least perceive to the outsider:
You are an important individual with many options in life. You have other things going on in your life, people to see, endeavors to accomplish, and dreams that you want to see come to life. You don't think twice about taking a woman out - you do this all the time. If this girl doesn't like you for one reason or another, someone else will!
BTW, a coffee date is sooooo boring, dude. It puts pressure on both of you to keep talking and entertain each other. I don't know how long you've been playing the game, but I've found that new members just can't keep a woman occupied for the entire length of the date and end up blowing it. They just don't have the conversational versatility that seasoned PUAs do.
You want a date that you can mutually enjoy together - window shopping, apple picking, ice skating, hiking, swimming, etc.
Now, that being said, I would text her on Wednesday at around 7:00PM.
Here's what you say: "Hey, it's my niece/sister/cousin's B-Day next week and I need to pick up a present. Let's go shopping instead!

"
Take her to an outlet, or a mall and buy a present (make sure it's returnable, discretely of course), then mention that you're starving and say "I know this great italian/sushi/french place over on [address], let's grab a bite."
When the bill comes, if she makes a fuss about paying say "How bout I pay for dinner, and I'll let you buy dessert." If she says it's getting late or something, just say calmly "No problem, another time then." Don't say it as if it's a question - say it as an afterthought.
That that, bud. If you feel I babied you a bit, sorry. I don't know your level of game competance.
In any case, Good Luck!