eill my baby starve herself?

Zainab • 2 early MC, 1 baby and another BFP hope this is my second rainbow baby
So my baby is exclusively breastfed. She is now 9 weeks old. I introduced a bottle at 4 weeks. She will take it but after crying and fussing and then will only drink 1-2 ounces and other times she will down 5 ounces. This makes me nervous because im going to be returning to work soon and its from 7am to 1:30pm so that is about two feedings sometimes 3 depending on her naps. My question is will she starve herself? Or will she end up taking the bottle caz she had to. I don't want her losing weight then getting stupid advice from people to supplement with formula (you know how people can be)