She's starving mom. Cows milk is NOT formula that is completely full of nutrition. She needs food. Now, not milk, food. In child care we mix milk in the formula gradually so their tummies will accept the milk and they won't have stomach issues for a month.
She's too young for straight up milk in my opinion, I'd have put her on straight formula instead but the doc knows the whole child and has their reasons I guess. Perhaps even that formula for toddlers. But formula is complete nutrition. Milk is a drink to go along with food. It's not anything like nutrition.
She is literally starving mom. YOU need to feed her as much table food as she'll eat. I certainly hope you are NOT feeding her baby food. That has no nutrition in it either. It's flavored goo to get her to chew and swallow. The nutrition in baby food is so minimal it's like giving a starving person a piece of gum. The sugar in it will make their tummy stop growling for a moment but it is not food or any kind of nutrition.
So to me it sounds like your child is starving, literally, and is drinking that many bottles to keep her hunger pains away because the milk is not feeding her. It's just a drink...like water is a drink.
She needs you to make her mashed potatoes, smashed up peas, green beans, carrots, and other veggies that can be boiled until they're really soft and can be mashed up a bunch. Avocados are a great food for her too.
She needs to eat 3 meals per day plus some snacks now that she's not on breast milk or formula. She is getting her complete food nutrition from what she eats now.
For good ideas on what she might like borrow these books from your local library.
How to feed your baby and toddler for Dummies.
Idiots Guide to feeding your baby and toddler.
Both of these books were staples in our house when the kids were little. They are awesome and inspiring.
Again, to get a baby off formula we start when they're 11 months old and mix in 2 ounces of whole Vitamin D milk with their regular formula. So they're getting 1/4 milk and 3/4 formula. Then when that is going well we go half milk and half formula. That usually takes a few days for their tummies to adjust to. Once they have stopped the diarrhea and upset tummy we go to 6 ounces milk and 2 ounces formula. Once they take this well we can usually go to straight milk.
So they're off formula by age one but not until they're chewing and swallowing okay. A lot of people feed baby food but they have no idea how gross it is for babies. They'd do so much better on processed table food instead.
So again, milk is NOT food in any way. It's a drink...like tea or juice or pop. NOT FOOD. She is STARVING and drinking that much during the night is her way of telling you she is not getting any nutrition. Give that child some food or have the doc do a line and feed her through that tube so she gets some nutrition.