I would listen to your HV, nod politely and do what you think is best for your DD personally! HVs don't have all the answers and judging from the variety of advice offered to people a lot seems based on their own opinions!
From 1 year they rec amount of milk is about 16oz, but formula is very filling so switching to cows milk is what they tell us to do. My DD still has her bedtime bottle (reflux formula) which her pead approves so I wouldn't be in a rush to drop that yet. I would try and get those teeth cleaned after the bottle though, that's why they want bottles dropped to protect the teeth.
We kept DD's morning bottle for a couple of months after she turned 1, swapped it around for breakfast first then changed it for a sippy with a snack mid morning.
I would keep offering milk in a sippy, it does take a while for them to take a decent amount from a sippy, we offer with food too. Maybe try a straw cup - that may work!
As you said, relax about it, let her have that morning bottle if you are happy with it and let her lead you with the sippy cups!
HTH!
Laura