Update: I was a bit worried for a while and didn't post anything. Since things are going better I'll elaborate on what has happened.
The female was doing fine for a while. In late December she stopped eating and started acting like the previous one, but not as bad. I force-fed her twice but found that to be too stressful for her, and me. I decided to let nature "take it's course".
I was out of town for NYE weekend and didn't expect her to make it while I was gone. During this time the male was acting normally. Much to my surprise, the female was still alive when I got back from NY. I continued to feed the tank but I never saw the female eat.
Finally, on January 19th, I saw her perk up and start eating again! I was extremely surprised to say the least. From what I've read, going that long without feeding is pretty rare. I'm assuming that she must have been eating something while I wasn't watching.
Long story short, she's doing fine now and more active than ever.
I'm hoping that the pair will decide to pair up and get busy at some point soon.