Yes, she would be--there is no minimum time to be married. All that matters is status--i.e. are you a spouse or not? If you are a spouse, which you are from the very moment you are married, then you are treated as a spouse for inheritance purposes.
All that is required to be eligible for such an inheritance is that the parties were married; the length of the marriage is of no conseqence. Accordingly, once the wedding officiant says,"You are now husband and wife", you are a legal heir.
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