any teen moms out there?

honestly, how hard is being a teen mom? I'm not pregnant, nor am I thinking of getting pregnant, I'm just curious. I mean, is giving up your teenage life to become a parent that difficult? my sister was fifteen when she had her daughter and she was a great mom for the first year, but since then (her daughter is 4 now) she always leaves the baby with our dad to babysit while she goes out and parties with her friends..she always talks about how hard being a teen mom is and that she just needs to go out to relieve some of her stress. I'm fifteen now and I just can't imagine leaving my baby at home for my dad to raise. is she wrong for doing this or is it something all teen moms do?