Don't feed again until at least 2 weeks from when she vomited. Sizing down is a good idea.
Large mice may be old breeders which tend to be too fatty- high calorie but harder to digest & less healthy to feed.
Rather than working to get her on the largest mice, which eventually will not be enough when she's an adult, you should try to transition her to rat pups, so that when she's an adult, one small or medium rat will be enough.
Mice & rats do smell & taste* different- keep in mind some snakes take right away to the change, while others act like you're trying to make them eat lima beans, lol. But one thing at a time- for now, wait a few weeks, & do a medium mouse. ( *I'm assuming- I haven't actually tasted them myself & none of my snakes actually talk.)
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