My pedi told me to let your LO determine how much they eat. (Mine was the same way.) If she wants more after she has finished her bottle, then I would offer her a little more. The book Baby 411 shows the below range of liquid they should eat per day based on age.
0 to 2 wks is 15 to 24oz
2wks to 2mos is 17 to 32oz
2mos to 4mos is 21 to 40oz
Hope this helps!