A.,
It's a VERY personal choice and an important one. Having said that, remember that it there is help available in the form of emotional support and physical support if you choose to continue with any breastfeeding.
I was in a situation with my daughter where I was a single mom with no one in my family (living) having ever breastfed and everyone thinking I was crazy! I worked 60+ hours each week in a small mall kiosk where I had to beg for breaks-- even to go to the bathroom and for a quick lunch... but I fought for my rights and I am GLAD that I did!
Okay, now that I have put myself up on the golden pedestal, here is what actually WORKED for me!
I joined La Leche League for emotional support and to have moms around me who could actually watch me nurse and let me know what I was doing wrong and right with latch, etc.
I kept water with me EVERYWHERE! And snacks in my purse, car, and the case of my pump so that I could always be nourished when I needed to be.
I pumped in my car with an electric Medela Pump-in-style that plugged into my cigarette lighter. I had a million icepacks to keep the milk cold, and sometimes was able to use a small refrigerator in the breakroom if I put the milk bottles in an insulated cooler/lunchbox where no one could see and complain.
I did nurse on demand when I was home, but also used a sling that I purchased from La Leche League (they are available online too from several companies) and was able, with much practice, to nurse while standing, playing with my nephew (whom I babysat sometimes) and doing all sorts of chores (never while cooking though- felt it was too dangerous.)
As far as additional pumping, I pumped as much as I could before I returned to work after my daughter was born and stored it in the freezer, and at home I alternated between a manual Avent pump (which was more comfortable for me) and the Medela (which was faster and hands-free.) Most often I would try to pump the other side while the baby nursed... seemed to get better "let down" that way.
Reason why I'm glad? I didn't get to see my baby often when she was tiny and it did facilitate a special bond with us. Also, she never was sick or had any allergies until she weaned (she self-weaned at 3.5 yrs) and now she has MANY allergies.
Research formulas if that is the way you decide to go, and do talk to other moms and your pediatrician about the best way to transition from breast to bottle/formula... you don't want to upset her tummy anymore if she is already having some gas probs, etc.
Good luck!
-Amanda