How much milk?

I’ve been combined bottle feeding my 2 month old but I’m still not sure how much pumped milk I’m supposed to give her? She has at most 5 ounces of formula so when I give her breast milk do I give her the same or less? It’s very difficult to tell when she’s full so I want to know roughly how much I should be offering to make sure I’m not over feeding? Is 5 ounces of breast milk too much? And she has breast milk every 2 hours really