Facebook / Anna Kepner

Anna Kepner 's aunt says the family is in "turmoil" as they are left with more questions than answers regarding the 18-year-old's murder aboard a Carnival cruise ship earlier this month.

Her aunt, Krystal Wright , told Fox 35 Orlando this week the family is "just sitting here waiting" for an update from authorities and described their frustration that further action against her stepbrother -- who is allegedly under investigation regarding her death -- has not been taken.

She implored ... "We don’t understand why, if the boy is a suspect, why has he not been charged yet? What’s happening there?"

We told you about it nearly 2 weeks ago -- feds are locking in on a minor for possible criminal charges in connection to her death ... which was officially r

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