Care of my Leopard Gecko

Question
hi for my birthday i got a 5 month old leopard gecko, which is now around 14 months old. She has always been active and healthy but in the last 4-5 days she has been very laid back not very active,her tail has become very very thin and she always eats her locusts but the last couple she's had shes thrown up.
could you please advise me on what you think is wrong with her
Many thanks shannon x

Answer
 She needs to get to her vet as soon as possible.  It is never normal for a reptile to throw up.  Please get her to a good reptile vet tomorrow.  You can find a reptile specialist nearest you by going to www.arav.org they have a member directory listed by state.