Swapping to cows milk

[Courts10]

I have started my lo on cows milk last night. She is on 2 formula bottles a day 7oz am 8oz PM and would usual leave a little in each bottle. But last night I straight swapped her bottle and she cleared it, then wanted more so I gave her another 4oz which she drank. This morning she also finished dry I didn't offer her any more as new she would have cows milk on her breakfast. So I have 2 questions

1. does cows milk not fill them up as much as formula or could she just prefer it?
2. can you ever give them too much milk, and how much do you give your lo?

Not sure on question number 1, but it definitely sounds as though she likes it

Once they are 12 months it should be a minimum of 10 flow a day of full fat cows milk, so it's fine to ditch the morning bottle if you like