P., I feel your frustration.
If she cannot afford childcare, maybe she will qualify for the state childcare assistance programs - CCMS. It usually helps most single mothers.
Also, when she is 4, she may qualify for the preschool 1/2 day program at your local elementary school. Qualification is usually by income or ESL.
Do you put her down for naps? If not, you may want to start. A lot can get done while a little one is taking a nap. Try putting her down 30 minutes after lunch for at least 1 1/2 hours - 2 hours. I used to make mine stay down for that long even if they wouldn't go to sleep. Most times if they lay there for over 30 minutes they tend to fall asleep anyway. We had to call it "resting" because they hated the word "nap".
The other option would be to help her pay for some type of childcare or mother's day out program so you can get some work done.
Hope this helps!