She could try it. But they might not issue a marriage license if they are not a resident of the state, particularly if they are attempting to avoid the age limit in the other state. Parental permission is the biggest key.
Yes it is legal
You file for divorce in the state in which you are a legal resident, even if that's not the state where you got married.
The legal gambling age in Louisiana is 21.
Isn't it legal in Mississippi?
Marriages are recognized throughout the US. If it is legal in Arkansas, it will be legal in Mississippi.
Yes
If the marriage is legal in Mississippi, Florida will recognize it.
No. Same-sex marriage is not legal under Mississippi law, regardless of where the couple is married.
You're still married until you obtain a legal divorce.
None. Same-sex marriage is not legal in Louisiana. See attached related question.
None, as same-sex marriage is not legal in Mississippi (see attached related question).
In Mississippi, the legal age for a youth to drop out of school without parental consent is 17.