OK, now that I have more information:
Evan, it is apparent you have a heart to evangelize this woman but there are two problems with that: #1 is that your wife saw that you were texting this woman and she has asked you to stop and #2 this woman has said that she doesn't want to continue this. Because of even just the fact that one of these is here, you need to discontinue your evangelizing efforts with her but with both, it is definite. Still pray for her but you need to guard your heart and mind and set up boundaries so that the woman doesn't feel that you are overstepping them in her mind and so you are not offending your wife.
One thing that has helped my husband and me with our relationship is to be totally open. He is a pastor and as such, I understand that there will be times that he will be in contact with someone and I cannot be privy to the information because of privacy but he always lets me know "Jill texted me today because she is having some issues." I do not text men with feelings based things because #1 I'm not a man and #2 I'm not a pastor so there is really no need for me to be texting a man other than for work related stuff. Should a man come to me for counsel, I will refer him to my husband or the number of professional counselors we have associated with church. That is just an area of caution that I take seriously. If my husband has to counsel a woman, there is always another woman in the building nearby who can visually see what is happening.
Evangelizing at work can be a tricky thing and while we say "Don't do it on your boss's dime", let's face it - a LOT goes on each day at work that has nothing to do with work and usually people are not bothered by it. Talking about our cars, our life, recipes, what we're doing for vacation, the news and culture - all sorts of things will be discussed but never cause a problem. I think religion can also be brought into this when we discuss with gentleness more "giving an answer" than "proclaiming the Gospel". What I mean by this is we can bring our faith into a discussion when we talk about things like "I'm going on vacation and I'm looking forward to spending time with my family. We're also going to be visiting a great church I've heard a lot about and I'm excited about it!" or "My church is having a VBS this summer and I know you have kids and I just wanted to give you info on it." and things like that. As I mentioned in my other post on this thread, even just hearing someone saying something about something in their life and offering to pray about it is a great way to bring up your faith in a non-threatening way. BUT when we get into "Hey Mike, you know you're a sinner and you need Jesus" as a conversation starter, then we just might have a problem but if Mike said "What does your faith believe?" then we can briefly and generally give an answer - "I believe we are all sinners and we need a Savior..." kind of thing.
I guess what I'm saying is be diligent in your work, be ready with an answer, live a life that is reflecting Christ, do not overstep boundaries and honor your wife. THAT is how we evangelize in the workplace.