Refusing bottles

Yall I am desperate, my daughter is currently eating 3 meals per day and up until the last month was taking 25-30oz per day in addition to 3 meals. In the last month she is refusing more than 2-4 oz in a bottle and is eating no more than 10-15oz per day. This has started to cause her to wake up in the middle of the night hungry for a 6oz bottle. I have tried cutting back on solids and offering more milk but she still refuses. We have tried multiple sippy cups, straw cups and 360 cups and she still refuses to take a full feeding I am at a complete loss...

Is 10-15 oz normal at this age? Should we be giving her less frequent bottles and snacks in their place?

She is small 16lbs and struggles to gain to begin with so I am terrified of her losing weight.