I was a huge over-producer from the get-go as well. In fact, one of the La Leche League leaders said she'd never seen anyone produce so much extra milk. I pumped FOUR extra GALLONS by the time my daughter was 6 months old--three of those went to a baby whose mom was having supply issues. I also was working at the time, so I wasn't doing TOO much to reduce my supply, but I still had to get through the day not changing my shirt 10 times!
Because the baby is still so young, it waill take some time to regulate. A couple of strategies:
-pump before nursing just enough to get the breast soft (BEFORE...it helps clear some of the watery foremilk--which can make the baby gassy--and ensure the baby gets the fattier hindmilk)
-only nurse on one side per session. Burp the baby after 6-8 minutes and latch back onto the same side. This helps reduce supply. If the non-nursed side is unconfortable, pump just to soften. Keep track of which side you're nursing on to keep them even.
-cold cabbage leaves in her bra will help relieve some of the discomfort and reduce some of the supply...be careful not to overuse.
If her baby is mainly getting foremilk, it will want to nurse more often. The foremilk is carb rich and the baby needs the hindmilk to be satisfied. But, even then, a breastfed baby can easily nurse every two hours...especially during a growth spurt.
It can be nice to have ample supply and easy let-down. It means you don't have to get into 20-30 minutes nursing sessions. I breastfed my daughter until she was 18 months old, and unless she was sick, she never nursed for more than 8-10 minutes per session.
Here is the tough love...she is a food supply. That baby has very few needs right now and nursing IS a major way the baby bonds. Take the time to relax and cuddle with the baby...even if it wants to suckle for a while. You can't spoil a newborn.
Good luck. I know it is hard. La Leche League was a lifesaver.