Hey Jessica,
I definately think if you want to go to uni, then do it! Even study part time if it's easier. In years to come, you'll probably find your life will be a lot easier with a uni degree under your belt. Also, I'm using uni as a way to get out a bit more and be more social. I'm lucky as my mum is desperate to watch Ruben as often as she can.
What were you thinking of studying? A lot of courses can also be done externally so you wouldn't have to worry about getting someone to look after Ashley