If your work is supportive of you pumping you really can get just as much milk from a pump as you can bfing (at least, i could).
I didn't realize it with my first, but going from the one job to another (same job, same company, different town) is why my baby weaned. I wasn't making milk because I couldn't pump as often.
But enough of that. I'd stay hydrated, and get a good pump. I think mamas here really like a few kinds (i used the advent isis, it was a single hand pump).
I'm not sure you can do anything more than you already are to encourage eating. Perhaps with you gone and just dh there, she might eat, she might not, and both are okay. She'll eat eventually, I promise.
((hugs)), and hope you get some rest soon.