You will regret it if you don’t take your shot. It’s probably best to do it at your work if she’s planning to come there anyway. That would eliminate the issue where she’s trapped by her job, and let you be more comfortable, as it’s your environment.

However, despite everyone’s aversion to it here, it is perfectly ok to ask a girl out at her place of work. Just read the signs, if she’s pulling away, or turning sidways to you, looking around the whole time, just walk away. But if she maintains eye contact (within reason), is smiling, leans in, or makes any attempt at physical contact, then you’re good to go. It’s possible she’ll still say no but you won’t be doing anything wrong by asking.