Actually, I found the folks at TSP to be very helpful and knowledge. Little to no hold times too. Both of these are very surprising. (877) 968-3778 is the number. She'll select federal employee,not military. She will however, need her TSP account number and special account access code. If she doesn't have both of those, she can request them. They have to mail them certified mail to your home of record so it takes about 2 weeks or so to get. Without that information, they can't give account specific, just answer general questions. Once shes got that, she can also log in to the TSP website and see her data in real time, which is nice.