D.G.
Hi A.. I am a mother of 3 breastfed kids and also am a lactation consultant. First of all let me congratulate you on nursing for 2 years. You have chosen to give your baby something that 25% of American women do not ever do.
Part of what may be happening here is that your 2 year old is trying to have more contact with you since you are away at work. I always suggest to my working moms that they co-sleep so the baby gets a little more contact with the working mom. However, in your case, waking that frequently during the night is really excessive. I have a few suggestions. Have a sippy cup and offer that when she wakes. Turn down the heat as she might be too warm and this may cause her to wake, especially if she is thirsty. Try having a conversation with her about the sun coming up-see it's dark out, see it's light out, now the sun is up, and after a day or 2 of this, tell her at bedtime that we are not going to nurse, or your word for that, until the sun comes up. She'll wake up, offer her the cup, and when she says no, she wants to nurse, say 'remember we are not nursing until we see the sun.' You both can also try playing 'dead' when she wakes up. You're not abandoning her as if she were down the hall crying for you. You are right next to her, but you are sleeping. She'll probably fuss and then lie down next to one of you and go back to sleep. And be sure that you spend as much time with her as possible during the day, which I'm sure you already do, even though you're exhausted.
This too shall pass...you'll look back one day on this and it will just be a blip in your motherhood :)