K.D.
Sounds like Anna is in full newborn mode. There isn't much you can do to get a newborn to sleep longer (especially at night when you'd like), but you can start teaching her that night is for sleeping and daytime is for staying awake and naps only. I found that if I kept my blinds open, went about my daily business (run the vacuum, dishwasher, let my older child be loud) and talked cheerfully and got them to play after a nap, that my kids learned that that was what went on during the day. At night, I'd keep the lights dim, would only speak to them in whispers and only to calm them, and promptly put them back to bed after feeding them, that they also learned night is for sleeping. But by their second month they were sleeping well at night, although still waking to eat anywhere from 3-6 hours, and were more awake during the day.
I know it's so much harder to get sleep when you have an older child at home, too. You can't just "sleep when the baby sleeps" like you can with your first. But I also found that I dealt with the sleep deprevation a lot better and a lot quicker the second time. Probably because I knew what to expect. Eventually your body will adjust. For now, just ask anyone you can for help, especially with the added stress of a c-section, even if it's to just watch your two-year old while you nap along with the baby. Have your husband take over when he gets home from work so you can take a nap. (I know he probably just worked a full day, but so did you AND you just had major surgery.) Try avoiding as much stress as you can. And if that means take out or frozen dinners and a messy house, so be it. No one will blame you or even care.
Good luck with your new baby and family!