Drinking enough milk?

I worry that my daughter isn’t getting enough milk. I offer her milk at every meal and at random times during the day, but she just doesn’t seem to drink much. I’m still breastfeeding her when she wakes in the morning and about 30 minutes before bed. For example, she has breastfed once this morning and has had only about 8 oz of milk so far. It is almost dinnertime, but I don’t expect her to take much. This is causing me so much worry; I have no idea why!! My doctor told me to have her drink water as well, and sometimes she will chug water and not touch her milk. Also, I am weaning her, and I plan to be completely finished breastfeeding by the end of March. Any advice/suggestions/help would be amazing! (I should mention that she eats everything you put in front of her, so I know she is getting calories and vitamins/nutrients.)