Breastfeeding help for my SIL

Makayla

My SIL is a FTM, I too am a FTM but I’ve never breastfed only formula. In the hospital the nurses gave her son formula without asking her and now here we are he’s a little over a week old and he nurses on each side for 20 minutes and afterward is still hungry so she gives him formula. She doesn’t want to do formula, only breastfeeding. Any help on what she needs to do? Thank you guys!