Keep nursing and don’t worry about pumping exactly what she needs to eat. Supply always gets low at night, so giving her a bottle of she’s hungry is ok too. When at home, try to do long nursing sessions-the baby can stimulate you to make more, but also it’s very soothing to them and you too. You will pump way more at work than you think. If she’s having a growth spurt you won’t pump much while you are home-she’s likely taking it all. Supplementing is the best of both worlds-baby is fed, and you can keep nursing as long as you want. Good luck the first is always so hard, the second time around it gets easier imo. I always did pump at 6am(I’d be very full at that time), and that early morning pump was always the best amount I’d pump in a day.