"She does not have to eat it."
Translation:Sie muss es nicht essen.
I've been misled by this false friend too! In English, when we negate "must", we mean that you absolutely MUST NOT do something, because "must" = very definite positive compulsion; however, in German, negating "muessen" changes it from "having to do something" just to "not having to do it". It helps to use the "have to do" translation first in your head in order to see the difference.
No, that doesn't help at all. The problem isn't confusion over what "muss" means. The problem is that the word order, specifically where "nicht" appears misleads what the sentence means. Translating "muss" as have to still gets you to "She has to not eat it." and does not get you to "She does not have to eat it."
I took a German audio course (not sure if I can say which was it here at duolingo) and its lessons deal with this matter and I remember a close example to this exercise. It was something like: how to you say "X does not have to Y" and the "audio teacher" explicitly said that one should use "Sie braucht es nicht zu..." instead of "sie muss es nicht..." The latter really sounds like "She must not..." instead of "she doesn't have to..."
I don't know whether there are any variations of this in German speaking countries but I would side the German course I took.
For English speakers it is better to remember these translations for "müssen" and "dürfen":
ich muss - I have to (=I must)
ich muss nicht - I do not have to (but I may, if I want)
ich darf - I am allowed
ich darf nicht - I am not allowed (=I must not)
As you can see - the similarity between English "must" and German "mussen" is confusing and they do no match exactly with each other. They are false friends :)
See the comment above -- "Sie darf das nicht essen" would be "she must not eat that"; the sentence asks for "she doesn't have to eat that".
It means that you should read the other comments before you post and make sure that you either have something to ask that hasn't already been answered or something of value to contribute. (Where "something of value" basically means "don't post random stuff that hasn't anything to do with the sentence or the language"). Questions about the sentences, grammatical constructions, the language, idiomatic use, the culture, or if you simply don't understand why a solution is correct/incorrect are highly welcome! If you have a question about a phrase that hasn't already been answered, by all means ask! :)