J.G.
It can be very hard & emotional when you are trying to go to school and have little ones. I went back to school for just over a year (I only needed 13 classes to get the degree I wanted)... I started back about 1 week after going back to work when my baby was about 9 month old. I was working from 8 - 4:30 M-F and went to school 3 nights a week till 10. I did have my weekend, but I also had to do the laundry, cleaning and get the harder homework done. I did try to do homework from about 5-6 (time I got to school till class started), but it wasn't always possible. Some nights I would stay up till almost 2 or 3 in the morning doing homework only to get up for work by 6:30/7:00. It was hard... you see I have 3 kids at home. Yes, daddy is here too, but I did feel like I was missing everything. I went from a SAHM to working full time & going to school full time in just a week.
What I did was set aside one day on the weekend... for family. Went to a park, played a board game, read books, had a special meal - whatever the family wanted to do. She is still within napping age - try to get some of the homework done when she is napping on the weekend. That way it doesn't away her mommy time.
Remember - you are doing what is best for her... in the end it will make a better life for her. You are far from a awful mom. I've been told quality time is always better then the quanity of time spent with the kids... try to get the time you spend with her to be special time not just time.
Also, remember to tell you folks thanks and show them how much it means to you that they are there for you and your daughter.
Good luck with school!