How old are you? You mentioned she's 31, but the way you're behaving seems like you're the less mature one here.
Anyway...
I took this as my opportunity to make a move.
So a couple of hours after work I texted her asking her out for next week saying I'll make a reservation.
This is not making a move. This is you not having the balls to ask her out in person, which is why you did it several hours later from behind a phone screen...
You're also asking her out for next week? Why not this week? Thursday, Friday, and Saturday are all prime drinking/relaxation days when the work week begins to taper off.
Whats everyone else feel?
For context, I've only read your original post and this reply. That said, you strike me as somebody who is committed to making their mistake, despite multiple people advising you otherwise.
What I would do:
Not try to sleep with women who I've been sharing the same workplace with for the past 3 and 1/2 years without the balls to make a move. If you're really hell-bent on getting THIS particular woman, I would start seeing other women outside of the workplace. Fill your schedule with other women. Lose interest in her. She'll wonder why she no longer has your attention, and if she's interested, she'll try to get it back. If that happens, you have to lead: pick a date, pick a place, pick a time. If she gives you some excuse without suggesting an alternative, I would forget about her completely.
What you'll probably do:
Text her again after not getting a confirmation of your date time and/or bringing it up the next time you see her at work, coming across as desperate. She'll probably agree out of politeness, but as the date approaches, she'll probably flake, but give you a convincing excuse, or promise to make it up to you the week after, then the week after that, and will continue to move that goalpost indefinitely.
The way she responds in your conversation about the rooftop bar sounds like she's more interested in having that experience, and less about having that experience with YOU. I do not think she is interested.
But hey, you'll probably have to learn that on your own. Too many people have already tried to steer you in the right direction, but you seem intent on crashing.