if you mentioned that she is still hungry from the 80ml. maybe you want to give 100ml. 80ml switch to 120ml is a huge gap. With regards to increasing of milk, have you tried to latch? Remember to drink and hydrate yourself, eat proper meals and have adequate rest.
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Have you tried milk boosters? It can help in increasing your milk supply. Also try to squeeze in a power pump session, it will have to stimulate more milk supply.
If really not enough why not feed formula? My 66days old baby is drinking formula since birth and now she's drinking around 90ml about every 2hrs.
Drink more fluids. Durian and milk with oats can boost my milk. Maybe you wanna give it a try? π
Drink more water. Try Milo. Oats. All these helps me