God as if mums don’t have enough to feel guilty about
Good advice above - check her weight percentile if it makes you feel better but from what you’ve said you are doing nothing wrong. If you’re worried about the milk start adding in some semi skimmed - if you do this gradually she won’t notice.
But… as a mum of teens and seeing how rife anorexia is, PLEASE speak to your husband and mum about the damage talk like this could do once you’re daughter is able to understand it.
Best of luck, and give yourself a break, you sound like you’re doing a fab job x