Truly looking for more youthful companion. Right now hitched, regular youthful marriage battles. No legitimate issues

Truly looking for more youthful companion. Right now hitched, regular youthful marriage battles. No legitimate issues. Mother takes little girl to see family 5 states away on booked fourteen day get-away on the grounds that he's dynamic in military and can't go. Michigan to FL. After three weeks she won't say if or when she is returning. What would he be able to do legitimately to get his little girl back in Michigan and begin guiding or seeking after a partition and impermanent care request?