Hopper mice are perfectly fine for bbaies up to 100g. Once over 100g they can take sm adults no problems
I have hatchlings from 40-80grams right now pounding Hopper mice.
Dont be surprised if she dont take a frozen as they take time as babies to switch over. First try few pre kill mice to wean her off live. Once thats successful then go to frozen. This is how i do all my hatchlings i hold back and never fails.