Hi SJ,
One trick that might help with the latch is when you are getting ready to breastfeed, touch your nipple to her nose. She will have to open wide and tilt her head up to latch on, which may help her get a wider latch. Also, have you tried using nipple shields??
As for how much a 6-week-old should eat, every 2-3 hours is "normal". I was told that during the night, at that age, they should not go more than 5 hours between feedings. Remember how tiny their stomaches are. Hopefully, if you get the latch corrected, she will start nursing every 2 or more hours instead of just 1 hour in between feedings. If it's only been 1 hour, you can try giving her a pacifier until it's closer to 2 hours. She may be sucking for comfort and not because she is hungry.
Also, I don't know if you are switching breasts during feedings. I've read differing opinions on that, but if you are switching, you could try only doing 1 breast per feeding. That way she would completely drain the breast.
In any event, I would more or less feed "on-demand", breast OR bottle. A baby that age knows when it's hungry and when it's full--I'm not a fan of regimented feeding schedules for infants. It's easy to obsess about how many ounces they're drinking once they are on a bottle. So long as she's growing and she has lots of wet diapers, she's OK. I couldn't even begin to tell you how many ounces my son drank. I was both breastfeeding and bottle feeding and we never paid much attention to the amounts. Our pediatrician at the time said, "Watch the output [poop and pee] and don't worry so much about the input."
As far as pumping and how often and when and if you should do so exclusively, the only person that can answer that is you. You have to find a way to make breastfeeding work for you, and how you handle it may change over time. I would really take it one day at a time. There is no "right" answer to any of that, and breastfeeding doesn't have to be an "all or nothing" deal. I don't know how realistic it is to not use at least a little formula if you are going to be working full-time, and you shouldn't feel like a failure if you choose to do so. I had to use some formula w/my son from Day 1. Good luck!