Hello-
I'm still nursing my 24 month old pretty much on demand. We co-sleep and she still night nurses 2-4 times. The number ends up being much higher if she is having a rough time with teething. (nursing seems to soothe her mouth).
I see you work full-time, have you considered co-sleeping? It may just be that she wants to be closer to mama at night because she is away from you during the day. This may or may not cut back on the number of times she wakes to nurse, but it would make it easier for you to roll over and let her latch while you go back to sleep!
The way I see it, they are only young once and the time spent fulfilling their night time needs is really a short while in the grand scheme of things. It is so comforting for them to be able to nurse back to sleep by their mamas and there has to be something said for how many babies/toddlers prefer this method. It is natural and how they were intended to fall asleep.
I also know of a lot of moms whose toddlers started STTN on their own between 2-2.5, so maybe you could stick it out a little longer and she will start improving.
It just sounds like you guys have such a trusting relationship, I would hate to see it strained by CIO. I think it is a lot harder on babies/toddlers than a lot of moms want to believe.
Whatever you decide to do, I hope you find something that works for your family!
-E.