Yep, I'm thinking growth spurt too. My little guy still does this and he's nearly two.
You gave her excellent advise about the pumping, and most of us who have BTDT know how hard it is to trust your body and that it is doing the right thing.
She's also probably starting to wake up a bit from that really sleepy newborn stage and her little body is adjusting to that. I found that weeks 3-6 hardest for both of mine.
She's doing a great job.
Sometimes a sling helps as bub really just wants to be close and snuggled but she still needs her hands free too.