We all have days when we get a bit depressed. I felt the same way Wednesday. had a bad day too. Some days, it's tough to stay positive when it feels like the world is collapsing around you. But, things do get better. Why don't you take your daughter to the park ? push her in the swing for a while if the weather is nice. If the weather isn't so nice, take her to the mall and go window shopping.
One thing I've learned about my own days when I feel depressed is this, "Get out of the house". Go for a walk. Go to the grocery store. Go to the gym. Staying at home just makes a person feel worse. Thus the reason to get out of the house so that you don't feel trapped.