Is ME time an option for single parents?

I am a single mom. I work full-time and my place of employment is a 45-minute drive each way. I wonder some days where I find the extra time to do everything I need to do. It is so hard some days. I wake up get my daughter ready, then me ready, drop her off at my sisters (who thankfully does me the favor of driving her to school), then I'm off to work. I work my 8 hours and rush back to pick up my daughter (who hates staying after-school, but sometimes lucky if my mom picks her up) by the time I get home it's 6pm. I like to cook her a fresh dinner and most of the time I do. Cooking dinner can be a long process I'm usually done at 7pm, she eats then I'm off to do laundry or clean-up while managing to help her with her homework. If she has something to do I run off and take her where she needs to go. I'm defintely not complaining, I do what I can, but I do find myself sheltering myself from friends. It's so hard to find the time to get together with them, since I feel there is such little time in my life. So little ME time. Is ME time even an option as a single parent?